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2. Universal Product Code - Wikipedia

   en.wikipedia.org/wiki/Universal_Product_Code

   A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...

3. GS1 - Wikipedia

   en.wikipedia.org/wiki/GS1

   GS1 is a not-for-profit, international organization developing and maintaining its own standards for barcodes and the corresponding issue company prefixes. The best known of these standards is the barcode, a symbol printed on products that can be scanned electronically. GS1 has 118 local member organizations and over 2 million user companies.

4. Global Trade Item Number - Wikipedia

   en.wikipedia.org/wiki/Global_Trade_Item_Number

   The Global Trade Item Number (GTIN) is an identifier for trade items, developed by the international organization GS1. [1] Such identifiers are used to look up product information in a database (often by entering the number through a barcode scanner pointed at an actual product) which may belong to a retailer, manufacturer, collector, researcher, or other entity.

5. Price look-up code - Wikipedia

   en.wikipedia.org/wiki/Price_look-up_code

   This allows codes to be defined by individual retailers or location, and allows the use of PLU codes in lieu of barcodes. There are retailer-assigned ranges for general and category-specific use. For example, 3170–3269 can be assigned by retailers to any goods, while 4193–4217 can only be assigned to apples. [citation needed]

6. International Article Number - Wikipedia

   en.wikipedia.org/wiki/International_Article_Number

   The barcode consists of 95 areas (also called modules [citation needed]) of equal width. Each area can be either white (represented here as 0) or black (represented as 1). From left to right: 3 areas for the start marker (101) 42 areas (seven per digit) to encode digits 2–7, and to encode digit 1 indirectly, as described in the following section

7. Barcode - Wikipedia

   en.wikipedia.org/wiki/Barcode

   These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called barcode readers, of which there are several types. Later, two-dimensional (2D) variants were developed, using rectangles, dots, hexagons and other patterns, called 2D barcodes or matrix codes , although they do not use ...