Point of sale barcodes
This barcode encodes an eight digit global trade item number (GTIN-8). These GTIN-8s are used to identify for very small products, and are allocated directly by each GS1 member organisation.
The ISSN (International Standard Serial Number) is an eight digit number used to identify newspapers, journals, magazines and periodicals of all kinds. The ISSN number (excluding the check digit) is converted into a GTIN-13 using the prefix 977, and extra data. ISSNs are allocated in the UK by the British Library, the UK’s ISSN agency.
GS1 DataBar Stacked
GS1 DataBar is a family of symbols that are smaller than EAN/UPC barcodes and they can encode additional information such as serial numbers, lot numbers or expiry dates. These can be used throughout the supply chain, including at the retail point of sale. The example here is a GS1 DataBar Stacked Omnirectional symbol that encodes a GTIN-13.
Traded unit barcodes
A special subset of Code 128, GS1-128 barcodes can encode all GS1 identifiers, such as GTINs for products, asset identification numbers, and serial shipping container codes for logistics units. They are usually printed on-demand as they often encode variable data such as best before end or expiry dates. The example here encodes a GTIN and a best before date.
GS1 DataMatrix is a special subset of Data Matrix, and is a two-dimensional symbol that must be read by a vision- or camera-based scanner. It cannot be used at retail point of sale, but it is the preferred symbol in the healthcare sector. It can be used to encode GTINs for products together with a batch number and expiry date. It is also used when identifying returnable surgical instruments or patient wristbands. The example here encodes a GTIN with a batch number and expiry date.