Mailing Glossary

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Address Change Service (ACS) – An automated process that provides change-of-address information to participating mailers who maintain computerized mailing lists. The information is captured in the Computerized Forwarding System (CFS) units and sent to the customer on electronic media, which reduces the volume of manual change-of-address notices.
Address Element Correction (AEC) – A process that identifies and revises incomplete or incorrect computerized address files and then attaches ZIP+4 and carrier route codes. It involves computer matching address records that cannot be coded using CASS-certified address matching software.
Ancillary Service - Forwarding, return, or address correction service included within a mail class. Depending on the mail class, these services are performed at a charge or at no additional charge, if and when the service is actually rendered.
Ancillary Service Endorsement – A marking used by a mailer to request the new address of an addressee and to provide the USPS with instructions on how to handle mail that is undeliverable as addressed.
Area Distribution Center (ADC) – A mail processing facility that receives and distributes mail destined for specific zip codes.
Aspect Ratio – The dimension of a mailpiece expressed as a ratio of length divided by the heigth (for letters and cards, length is the dimension parallel to the address). For example, a postcard 5.5" long by 3.5" high has an spect ration of 1.5. An aspect ratio between 1.3 and 2.5, inclusive, is required for automation compatibility.
Automation Discount – A postage reduction offered to mailers who prebarcode their mailpieces and meet addressing, readability and other requirements for processing on automated equipment. The discount is relative to the single-piece rate for the mail class.
Automation Template – A plastic tool that aids in designing letter size mail for automated processing. It includes mailpiece dimensions, placement guides for key information and print specifications.
Auxiliary Service Facility (ASF) – A mechanized facility, usually part of a general mail facility that has its own service area and serves as a satellite processing hub for a particular bulk mail center.

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Barcode (BC) – A series of vertical bars and half bars representing the ZIP Code information for the delivery address on a mailpiece. The barcode facilitates automated processing by barcode reader equipment. Each numeric digit is represented by a series of five bars (always a combination of two full bars and three half bars). A complete barcode contains two bars framing the code; the five, nine or eleven digits containing ZIP Code and address information; and a final correction digit that allows the machine to check its reading of the ZIP Code number.
Barcode Clear Zone – A rectangular area in the lower right part of a letter-sized mailpiece that must be kept free of printing and symbols, except for the barcode itself. This requirement allows automated processing machines to read or apply a barcode.
Barcode Read Area – A small area within the barcode clear zone in which the barcode must be printed. This area is defined by the position of the leftmost bar of the barcode and the bottom edge of the bar.
Barcoded Discount - A postage discount available for certain Package Services macinable parcels and Bound Printed Matter flats that bear correct barcode and meet other size, shape, and volume requirements.
Bindery – Trimming, folding, perfing, drilling, saddle stitching, spot gluing to provide the finishing touches to your printed piece.
Bleed - An extra amount of printed image which extends beyond the trim edge of the sheet or page.
Bound Printed Matter (BPM) – A subclass of Standard Mail (B) that weighs at least 1 pound but not more than 10 pounds and that consists of permanently bound sheets of which at least 90 percent are printed with advertising, directory, editorial matter or a combination of these.
Bulk Mail Center (BMC) – A highly mechanized mail processing plant that is part of the National Bulk Mail System. This facility distributes Standard Mail (A) and Periodicals in bulk form and Standard Mail (B) in both piece and bulk form.
Bundle - A group of addressed pieces assembled and secred toghether to make up a basic unit of bulk mail for processing purposes.
Bursting – The process of separating mail pieces connected by a perforation into individual pieces.
Business Reply Envelope (BRE) – An envelope that is inserted in the mail package that already has the address printed on it. Sometimes postage is required.
Business Reply Mail (BRM) – The domestic service that allows a mailer to receive First-Class Mail back from customers and pay postage only for the pieces returned to the mailer from the original distribution. Postage and fees are collected when the mail is delivered back to the original mailer.

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Carrier Route Presort Mail – Mail that the mailer arranges by carrier route to qualify for discount postage rates. The mail requires no primary or secondary distribution. The term is a general descriptor of the available rates for this type of preparation, including Enhanced Carrier Route Standard Mail, automation carrier route First-Class Mail, carrier route Periodicals, and carrier route Bound Printed Matter. Except for automation rates, this mail usually does not bear a barcode.
Centralized Account Processing System (CAPS) - It is an electronic postage payment system that provides business mailers a centralized, convenient, and cost effective way to fund postage.
Classification – The grouping of mailable matter into mail classes and subclasses by rate categories, according to content, weight, size, and preparation standards.
Coding Accuracy Support System (CASS) – A process designed to improve the accuracy of ZIP+4, 5-digit Zip Codes, and carrier route codes that appear on mail pieces. This is required by the USPS for mailing to qualify for the automated discount.
Color Inkjetting – Use personalized colors in one pass, ½ inch per color.
Collect On Delivery (COD) – A method of payment for certain classes of mail in which the recipient pays for the item mailed at the time of delivery.
Commingle – To integrate dissimilar material (for example, subscriber and non-subscriber copies, Standard Mail (A) and Standard Mail (B) parcels) into the same mailing; this may require USPS authorization.
Confirm – USPS mail tracking and reporting system in which a Planet Code barcode is printed onto mail pieces and then tracked by the USPS during processing.
Conversion Rate – The factor used for specific types and classifications of mail when converting weight, containers or feet of mail to number of pieces.
Courtesy Reply Mail (CRM) – Envelopes or postcards that a mailer provides to its customers to expedite delivery of their responses. The customer affixes the reply postage before mailing.

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De-duping – The process of removing duplicate records from one or multiple lists.
Delivery Point Barcode – A POSTNET barcode that consists of 62 bars that identify a primary address. The DPBC allows automated sortation of letter mail to the carrier level in walk sequence.
Delivery Point Validation (DPV) – Most often performed as part of the CASS process. DPV ensures that an address is a physical destination.
Destination Delivery Unit (DDU) – A postage discount for depositing mail at specific postal facilities that are closer to the final destination of the mail.
Digital Printing – Electronic documents are transferred digitally from a workstation directly to an output device (usually a press or high speed laser printer). A cost effective method – eliminating material and labor charges at both the pre-press and printing stages. Offers faster turn-around time, print on demand and variable data/personalization.
Direct Mail – An industry term for advertising mail sent to targeted markets. It can be any mail class, but it is usually Standard Mail (A).
Domestic Mail – Mail transmitted within, among and between the United States; its territories and possessions.
Domestic Mail Manual (DMM) – This is a book that gives you all the information about mailing a piece, the size and all the postal regulations. It will explain and go through all types of mail.
Drop Shipment – A mailing transported by the mailer or a private (non postal) carrier, from the point of production to a postal facility located closer to the destination. Express Mail and Priority Mail drop shipment, however, are transported by the USPS instead of a private carrier.
Dual Tabbing – Two tabs used to seal such things as books and some selfmailers. Postal regulations require Dual Tabs on certain mailings.
Duplex Inkjetting – Multiple inkjet heads provide personalized imaging.

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Encoded Mail – Mail processed on a multiline optical character reader (MLOCR) that has a barcode representation of its ZIP+4 printed on the lower right corner of the mailpiece. USPS optical character reader or remote encoding equipment can barcode the piece, or the customer can preprint the barcode on the piece.
Endorsement – An authorized marking on a mail piece that shows handling instructions, a special service or a request for an ancillary service.
Expedited Plant Load Shipment – An authorized verification and receipt of postage payment for mailable matter at the mailer’s plant, prior to the mailer’s transport of the shipment to a destination postal facility.

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Facing Identification Mark (FIM) – A series of five or six vertical bars used by automated postal equipment to identify, orient, and separate reply mail.
First-Class Mail (FCM) – A mail class that includes all matter wholly or partly in handwriting or typewriting, all actual and personal correspondence, all bills and statements of account, and all matter sealed or otherwise closed against inspection. First-Class Mail comprises three subclasses: Post and Postal Cards, Letters and Sealed Parcels, and Priority Mail. Any mailable matter may be sent as First-Class Mail. First-Class Mail is a USPS trademark.
Flat-Size Mail – A mailpiece that exceeds one of the dimensions for letter-size mail (11 ½ inches long, 6 1/8 inches high, and ¼ inch thick) but that does not exceed the maximum dimension for this mail processing category (15 inches long, 12 inches high, ¾ inch thick). The dimensions are slightly different for automation rate eligibility. It may be unwrapped, paper-wrapped, sleeved-wrapped or enveloped.
Fletter - An industry term used to describe a mail piece that can be classified as letter size mail but could also meet the standards for and be mailed as automation flat sized mail.
Fold & Spot Glue – Folding and Spot Gluing in one operation provides a fast clean sealing solution used on selfmailers and double/triple postcards.

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Graphic Inkjetting – Line art, logos, and special fonts can be inkjet imaged. The art can be specific to each record in a database.

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Indicia – An imprinted designation on a mailpiece that denotes postage payment (for example, a permit imprint in place of a postage stamp or a meter stamp).
Inkjet – A method of printing that places ink on the paper by spraying droplets through tiny holes.
Insert – A letter, card or similar item placed inside an envelope or another mailpiece (ie: catalog)
Insured Mail – A special service to customers who pay a fee in advance to obtain payment in the event that the mail is lost, rifled or damaged.
Intelligent Mail Barcode – Formally known as the 4-State Customer Barcode is USPS barcode technology used to sort and track letters and flats. Intelligent Mail Barcode technology, among other things, combines the capabilities of the POSTNET Barcode and the Planet Barcode into one unique barcode. (AKA One Code Barcode)
Irregular Parcel and Pieces (IPP) – A mail processing category for a parcel that does not meet the dimensions of machinable parcels and other parcels that cannot be processed by parcel sorters.

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Label Application – Applying teaser labels, sticky notes or piggyback labels by machine.
Laser Imaging – The ability to add personalization to a letter whether in the salutation or the body of the letter.
Letter-Size Mail – A mail processing category of mailpieces, including cards that do no exceed any of the dimensions for letter-size mail (that is 11 ½ inches long, 6 1/8 inches high, ¼ inch thick).
Live Stamps – Stamps that are machine affixed to the piece for certain customers and jobs.
Local Mail – Mail addressed for delivery within the postal area of the post office where the piece is mailed.
Locatable Address Conversion System (LACS) – A process to convert old (undeliverable) rural addresses to city-style addresses (house number and street name), which is being done nationwide in order to support the implementation of 911 emergency services

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Mail Evaluation Readability Lookup Instrument (MERLIN) – A tool that is used by the U.S. Postal Service to assist with the acceptance of business mail.
Mail.DAT File - Is a standard database file used by most of the mail production industry and the US Postal Service. Mail.DAT identifies 19 file characteristics that can exist within a mailing.
Mailing Lists – Compile residential, consumer and business lists. Targeting specific demographics, lifestyles, and geography is a portion of what can be obtained.
Match Mailing – A mailing in which an outer envelope and one or more inserts contain the same personalization and need to be kept together to form a single mailing package.
Merge/Purge – The process of merging data from separate files into one file and purging any unwanted information as well as removing any duplicate records.
Meter Imprint – A postage imprint (either on meter tape or as a direct impression) applied in the upper right corner of the envelope, address label or tag. The type, size and style of the imprint must be fixed when the postage meter is approved for manufacture by the USPS. For letter-size mail, the imprint must be set in fluorescent ink.
Meter Tape – The USPS approved tape on which metered postage is imprinted.
Metered Mail – Any mail class (except Periodicals) with postage printed by a USPS-approved postage meter. This mail is entitled to all privileges and subject to all conditions that apply to the various mail classes.
Metered Postage – Postage printed by a mechanical or electronic imprinter directly onto the mailpiece or onto gummed tape or labels affixed to the mailpiece. It may be used on all mail classes except Periodicals.

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Nth Select – This is a method used to take a random section of a total list. A fractional unit is repeated to pull a sampling of the list. It could be used to test mail to a “10 th” of a list for example.
National Change of Address System (NCOA) – A file maintained by the US Postal Service with new addresses of those who have recently moved and notified the Post Office of their new address. Commercial vendors who are licensed by the US Postal Service can match a mailing list against this file to update old lists.
Nixie – A piece of mail that has been returned to the mailer by the Postal Service. The reason for return is an incorrect or undeliverable name and address.
Non-machineable – The incapacity of a mailpiece to be sorted on mail processing equipment because of size, shape, content or address legibility. Such mail must be processed by manual distribution.
Nonprofit Rate – A preferred rate for a mailer who has Non-Profit status and has been approved by the USPS.
Nonprofit Standard Mail – A subclass of Standard mail that is available only to qualified organizations specified by the U.S. statute.
Nonstandard Size Mail – First Class Mail or single-piece Standard Mail (A) and exceeds any of these size limits:

  • More than 11 ½ inches long
  • More than 6 1/8 inches high
  • More than ¼ inch thick
  • Does not fit piece Aspect Ratio (See Aspect Ratio)

This type of mail incurs a surcharge.

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OCR Read Area – A clear area around the text to be read by the OCR to enable the computer to successfully interpret the intended characters.
Open-end envelope – A catalog envelope with the opening across the shorter dimension (not machinable).
Open-side envelope – A booklet envelope with the opening across the longer dimension.
Optical Character Recognition (OCR) – The technology that allows computers to “read” the text from physical objects.
Optional Endorsement Line (OEL) – A series of specific printed characters on the top line of the address block that identifies the sortation level of a package or bundle.
Origin Facility – The point of entry where mailing is verified.
Overflow Tray – Less than full tray that contains all pieces remaining after preparation of full trays for the same destination. An overflow tray may be prepared only if permitted by standard.

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Pallet – A platform made of high-quality rigid, reusable material (wood or plastic) on which mail is stacked for four-way forklift entry (as a single unit) and used to transport mail between mailers, bulk mail centers and postal facilities. This type of mail transport equipment must hold loads equal to a gross weight of 2,220 pounds and a volume of up to 65 cubic feet. A USPS pallet is 48 inches by 40 inches.
Palletization – A process of preparing mail on a pallet under specific standards for transportation.
Parcel – Mail that does not meet the mail processing category of letter-sized mail or flat-size mail. It is usually enclosed in a mailing container such as a carton.
Periodicals – A mail class (formerly called second-class mail) consisting of magazines, newspapers or other publications formed of printed sheets that are issued at least four times a year at regular, specified intervals (frequency) from a known office of publication. Periodicals must have a list of subscribers and/or requesters, as appropriate.
Permit – Any authorization required for specific types of preparation or postage payment. Specifically, an authorization to mail without postage affixed by using indicia or an imprint. Payment is made against an advance deposit account that is established with the USPS for postage and special services.
Permit Imprint – Printed indicia, instead of an adhesive postage stamp or meter stamp that shows postage prepayment by an authorized mailer.
Piece Count – A calculation of mail volume that provides the actual number of mailpieces processed. It is generated by machine meter, machine printouts or actual counts. If these methods are not feasible, the weights, number of containers or linear feet of mail are multiplied by a national conversion factor to determine the number of mailpieces.
Piece Rate – The postage charged for each mailpiece in addition to the pound rate charge, if applicable, for the entire mailing. In transportation under contract, a basic payment according to the number of pouches, sacks or outsides. Rate may be determined by distance from origin to destination or by amount per piece.
Piggy Back Label – A label on which the address is printed and can be pulled off and will adhere to a returnable piece.
Planet Barcode – Provides tracking information for mailers using PLANET code technology, which stores information about a mail piece using a unique barcode. The encoded data is captured when the mail piece passes through Postal equipment. The data is then transmitted to the customer’s computer system or to the Confirm Web site.
Plant Load – An operation in which the USPS provides mail transportation for bulk mail from the mailer to a downstream facility, bypassing the local post office.
Plant-Verified Drop Shipment (PVDS) – A procedure that enables origin verification and postage payment for shipments transported by the mailer from the mailer’s plant to destination post offices for USPS acceptance as mail. It is typically used for mailings for which a destination entry discount is claimed.
Polybag – A packaging solution for multiple pieces and heavier catalogs.
Postage – Payment for delivery service that is affixed or imprinted to a mailpiece usually in the form of a postage stamp, permit imprint or meter impression.
Postage Meter – A mechanical or electromechanical device that can print one or more denominations of an authorized postage indicia. It is available for lease only from designated manufacturers.
Postage Statement – Documentation provided by a mailer to the USPS that reports the volume of mail being presented and the postage payable or affixed and certifies that the mail meets the applicable eligibility standards for the rate claimed.
Postal Logistics – Lists are analyzed to see if the mailing would qualify for Bulk Mail Center or Commingling discounts.
Precanceled Stamp – A postage stamp canceled by marking across the face. Precanceled postage is an optional postage payment method for mailings at Presorted and Automation First-Class Mail rate and at all Presorted Standard Mail rate.
Presort – To sort mail in a mailing according to USPS standards before presenting the mailing at a post office. The sortation is usually by ZIP Code or a carrier route. All automation rate mail is presorted by the mailer.
Presorted Mail – A form of mail preparation, required to bypass certain postal operations, in which the mailer groups pieces in a mailing by ZIP Code or by carrier route or carrier walk sequence.
Printed Matter – Paper on which words, letters, characters, figures or images (or any combination of them) not having the character of a bill or statement of account or of actual or personal correspondence, have been reproduced by any process other than handwriting or typewriting. In international mail, this is a classification that includes books and sheet music, publishers’ periodicals and regular printed matter (all printed matter other than the aforementioned types).
Priority Mail – A subclass of First-Class Mail that weighs more than 11 ounces and usually consists of flats and parcels. It provides faster delivery than Parcel Post. At the mailers’ option, mail weighing 11 ounces or less may be sent at the Priority Mail rates. Any mailable matter may be sent as Priority Mail. Priority Mail is a USPS trademark.

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Qualified Business Reply Mail (QBRM) – An automated means of processing and calculating postage plus fees on business reply mail. QBRM pieces must meet certain design specifications and may be eligible for the lowest per piece fee available for BRM and for reduced automation First-Class Mail postage rates.
Qualifying Piece – A mailpiece that meets all standards for a certain rate or discount.

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Reflectivity – A test that is done on the paper stock of the address device to make sure that the barcode can be read by the postal machines.
Refold – Running a flat size saddle-stitched publication thru a knife folder to make the publication an 8.5 x 5.5 mail piece which can lower postage.
Repositionable Note (RPN) – A 3x3" sticky note with 1 inch of repositionable glue.
Residual Mail – Mailpieces remaining after the completion of a presort sequence. It lacks the volume set by standard to require or allow package, tray or sack preparation to a particular destination. Residual mail does not qualify for the presort rate.
Reticle – An eye piece with a magnified template that is used to check postal specs and quality.
Return Address – A mailpiece element that is usually placed in the upper left corner of the mailpiece to indicate the address of the sender. This address indicates where the sender wants the mail returned if it is undeliverable and where the sender will pay any fee due for that mail.
Residual Postage - Additional postage due. For bulk stamps or meter jobs, it is the difference between the value of the stamp affixed to the mail piece or the metered amount and the actual postage for the mailing. Paid at the time of the Postal Entry.

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Sack – A container generally used to transport flat-size mail, parcels and loose pack mail. Made of sewn fabric (nylon, polyester, canvas or plastic with an opening at one end) and is closed with a draw cord and fastener.
Sectional Center Facility (SCF) – A postal facility that serves as the processing and distribution center (P&DC) for post offices in a designated geographic area as defined in the first three digits of the ZIP Codes of those offices.
Seed – A unique name that is inserted into a mailing list to verify usage. It is used frequently on purchased lists that are sold for one time use only (aka Decoy).
Selfmailer – A mail piece that is folded down to letter size in order to reduce postage, it may need to be tabbed or spotglued.
Sequence – To place mail in the order of its delivery. Mailers generally receive certain discounts based on the type of sequencing.
Shrink Wrap – A plastic film that is placed around mail or packages and then heat-sealed to enclose it tightly.
Standard Industrial Codes (SIC Code) – It is a numerical numbering system that identifies business types within the national database. For example, SIC 8611 identifies Associations.
Single Piece Rate – A postage rate available for individual pieces of Express mail, First class mail, priority mail, and standard mail.
Skew – The misalignment (or slant) of a bar (in a barcode), complete barcode, character or line of characters with respect to the bottom or top edge of the mailpiece.
Sleeve – A paperboard jacket that fits over the four sides (top, bottom and two parallel sides) of a letter tray in order to keep the mail inside the tray from falling out.
Slip Sheet – A piece of paper that is used to separate 5-digit carrier routes, the sheet should be tall enough so it sticks out above the mail piece.
Sort – To separate mail by a scheme or ZIP Code range; to separate and place mail into a carrier case; to distribute mail by piece, package, bundle, sack or pouch.
Sortation – The distribution or separation of mail to route it to its final delivery point.
Stamp Affixing – Applying a live stamp (Standard, First Class, Non-Profit) will improve your response rate.
Standard Mail (A) – Standard Mail that weighs less than 16 ounces. It comprises the subclasses of Regular, Nonprofit, Enhanced Carrier Route, and Nonprofit Enhanced Carrier Route and Single-Piece. These subclasses include circulars, printed matter, pamphlets, catalogs, newsletters, direct mail and merchandise. Standard Mail (A) may be sent at presorted rates and at automation rates.
Standard Mail (B) – Standard Mail that weighs 16 ounces or more. It comprises four subclasses: Bound Printed Matter, Library Mail, Parcel Post and Special Standard Mail.

 

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Tab – A small adhesive device used to seal a mailpiece closed for use in automated mailing equipment.
Tag – A piece of cardboard or plastic that is attached to a pouch, sack or tray. It is usually in addition to the container label and is printed in various colors and provides information on contents, mail class and sortation type, routing instructions and specific handling information
Tap Test – The tapping of an envelope to make sure the address device does not deviate from the window of the envelope.
Tray – An open container for holding letter-size mail or flat-size mail. It has a flat bottom and four or three sides and is made of cardboard (sleeved) or plastic (unsleeved). Also, to place mail in a tray for mail processing or dispatching functions.

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Undeliverable as Addressed (UAA) – Mail that the USPS cannot deliver as addressed and must forward to the addressee, return to sender, or send to a mail recovery center.

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Verification – The procedural checks of a mailing presented by a mailer to determine proper preparation and postage payment.

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Walk Sequence – The order in which a city carrier delivers mail for a route. This order is required for most carrier route presort mail.
Window Envelope – An envelope with one or two openings (cutouts) on the address side through which a delivery address or barcode printed on the letter or insert placed in the envelope can be read. The openings must be covered with transparent material (such as glassine) for certain types of mail (such as registered mail).

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Zip Code – The five-digit numeric code of which the first three digits identify the delivery area of a sectional center facility or a major-city post office serving the delivery address area. The next two (the fourth and fifth) digits identify the delivery area of an associate post office, post office branch or post office station. All post offices are assigned at least one unique 5-digit code. ZIP Code is a USPS trademark.
Zip+4 – The nine-digit numeric code, established in 1981, composed of two parts: (a) The initial code: the first five digits that identify the sectional center facility and delivery area associated with the address, followed by a hyphen; and (b) the four-digit expanded code: the first two additional digits designate the sector and the last two digits designate the segment. ZIP+4 is a USPS trademark.
Zone – A number that expresses the distance that a zone rate mailpiece must travel from point of entry to point of delivery. It is based on the air mileage along a great circle line between three-digit ZIP Code prefix areas of dispatch and receipt. This mileage range is converted to a zone number. The USPS uses eight numbered postal zones and one local zone for computing postage on mail.
Zone Chart – A table that shows the zone number between 3-digit zip code prefix areas.
Zoned Rate – A rate structure for certain Standard Mail (B) and all Periodicals and Priority Mail, based on weight and distance traveled (or zones crossed).

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ACS – Address Change Service
ADC – Area Distribution Center
AEC – Address Element Correction
ASF – Auxiliary Service Facility
BC - Barcode
B2B – Business to Business
B2C – Business to Consumer
BMC – Bulk Mail Center
BMEU – Business Mail Entry Unit
BPM – Bound Printed Matter
BRE – Business Reply Envelope
BRM – Business Reply Mail
CAPS – Centralized Account Processing System
CASS Certification – Coding Accuracy Support System
CMM – Customized Market Mail
COD – Collect on Delivery
CRM – Courtesy Reply Mail
CRRT – Carrier Route
DDU – Destination Delivery Unit
DMM – Domestic Mail Manual
DPV – Delivery Point Verification
FCM – First Class Mail
FIM – Facing Identification Mark
IPP – Irregular Parcel and Pieces
LACS – Locatable Address Conversion System
LOT – Line of Travel (walk sequence)
MCM – Multi Channel Marketing
MERLIN – Mail Evaluation Readability Lookup Instrument
NCOA – National Change of Address System
OCR – Optical Character Recognition
OEL – Optional Endorsement Line
PO– Post Office
PVDS – Plant Verified Drop Shipment
SCF – Sectional Center Facility
SIC Code – Standard Industrial Codes
UAA – Undeliverable As Addressed
USPS – United States Postal Service
ZIP – Zone Improvement Plan

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