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In simple terms a bar code is a series of bars and spaces of varying widths, which can be read by a scanner. More than 200 different styles or languages (symbologies) were invented but only a handful are used regularly. They are code 39, ITF-Interleaved 2 of 5, code 128,  and GS1 standards. GS1 enables any product to be uniquely identified by a number any where in the world. 

The most commonly recognized barcode is the GTIN13symbol/bar code, which is used to identify most items sold at the Point of Sale. The prefix 616 was allocated to Kenya, denoting all bar-code numbers that have been issued by GS1 (TZ) National Limited. All numbers issued by GS1 (TZ) National Limited therefore start with the country prefix 616.
Barcodes: various types: various applications

 

 
 
 
 
 
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