GS1-128 is a variation of the Code 128/GS1-128 symbology. The distinguishing feature of the GS1-128 is its Application Identifier (AI) prefix. An AI is a numeric two, three, or four digit prefix that defines the structure of the data that follows it. The GS1-128 symbology also has a unique start code pattern that consists of a start code A, B, or C character and a Function 1 (FNC1) character.
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