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Standard 2-of-5, also known as IATA 2-of-5, is a member of the Code 2-of-5 symbology family. It is used by the International Air Transport Association for the processing of airline cargo.

The spaces in a Standard 2-of-5 symbol are fixed width, so that only the black bars are used to encode information. Of the five bars used to encode each character, two are wide; the remaining three bars are narrow.

This symbology supports the numeric characters 0 through 9.