Other Barcode-Like Markings

Click here for a condensed list of these symbologies.

Facing Identification Mark (FIM)


Used by the United States Postal Service (USPS), the FIM symbology is used to assist automated mail processing. There are only 4 valid symbols which can be generated using the characters A-D as shown in the table below.

Letter CodeUsage
AUsed for courtesy reply mail and metered reply mail with a pre-printed PostNet symbol.
BUsed for business reply mail without a pre-printed zip code.
CUsed for business reply mail with a pre-printed zip code.
DUsed for Information Based Indicia (IBI) postage.



Used for the recognition of page sequences in print-shops, the Flattermarken is not a true barcode symbol and requires precise knowledge of the position of the mark on the page. The Flattermarken system can encode any length numeric data and does not include a check digit.


This is a method for creating 4-state codes where the data encoding is provided by an external program. Input data should consist of the letters D, A, F, and T, where these refer to descender, ascender, full (ascender and descender) or tracker (neither ascender nor descender) respectively.


Any characters other than D, A, F, or T are ignored.