GS1-128 is commonly known as Code 128 or EAN-128.  It encodes all 128 'ASCII' characters and it also includes a check digit. It is more compact than other similar barcodes (e.g. Code 39) and is thus preferred for small items.

A special non-data Function1 character may be included after the start character, or omitted. It can be recognized by scanner software as a signature feature of these types of barcode – useful when an object bears several barcodes.

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Links

UPC-A

UPC-E

UPC-8 / EAN-8

UPC-13 / EAN-13

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