Standard 2 of 5 Barcode

Standard 2 of 5, also known as Industrial 2 of 5, is a low-density numeric symbology that has been with us since the 1960s. It has been used in the photofinishing and warehouse sorting industries, as well as sequentially numbering airline tickets. The symbology is called "2 of 5" due to the fact that digits are encoded with 5 bars, 2 of which are always wide (and the remaining three are narrow).

A more efficient implement of Standard 2 of 5 is the newer Interleaved 2 of 5. The encoding method is essentially the same except that Interleaved 2 of 5 allows information to be encoded in both the bars and spaces, whereas Standard 2 of 5 only encodes information in the width of the bars. Thus, Interleaved 2 of 5 is a slightly higher-density symbology. The main advantages of Standard 2 of 5 are its simplicity and the fact that it can encode any number of numeric values, whereas Interleaved 2 of 5 must always encode an even number of numeric values.

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