Global Trade Item Number or GTIM is a universal standard for barcodes, developed and maintained by GS1 international organization. GTIM standards incorporate such barcode systems, as European Article Number (EAN), International Standard Book Number (ISBN), International Standard Serial Number (ISSN), International Standard Music Number (ISMN), some of Universal Product Codes (UPC), and others.
GTIM standard specifies 8, 12, 13, and 14 digit long barcodes.
