Code 39.

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Code 39.

Code 39 is a widely used alphanumeric code that supports numbers and characters 0-9, A-Z, ".", space, "$", "/", "+" and "%". It does not support lower case characters. Code 39 is self-checking, and does not normally use a check digit. An asterisk is used as a start and stop character, which Cognitive printers automatically adds to the bar code. The asterisk does not normally print as part of the bar code subtext.
Advantages : Alphanumeric representation.
Disadvantages : Low information density.