Codabar is a simple linear barcode symbol developed in 1972. It is called NW-7, USD-4, Code 2 of 7 (2 values of bar length, 7 elements). It is often used in the medical field (blood bank paper, etc.).
| Valid symbols: | 0123456789-$: /. + ABCD (only as start / stop symbol) |
| length: | variable |
| Check digit: | number |
Four bars and three spaces are used for coding. The letters are separated by spaces, and the width of the spaces is a thin stroke. This barcode has four types of start / stop characters. These characters are only used as start / stop characters and do not appear in barcodes.
"Codabar" barcode. "A12345678A" is a barcode-encoded number.
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