Unique identifier regimes

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The Amazon Standard Identification Number ( ASIN ) is a 10-character alphanumeric unique identifier assigned by Amazon.com and its partners for product identification within the Amazon.com organization. [ 1 ] Amazon.ca, [ 1 ] Amazon.co.uk, [ 2 ] Amazon.de, [ 3 ] Amazon.fr, [ 4 ] Amazon.it, [ 5 ] Amazon.co.jp, [ 6 ] Amazon.cn, [ 7 ] and Amazon.es [ 8 ] also use ASINs. Although ASINs used to be unique worldwide, global expansion has changed so that ASINs are only guaranteed unique within a marketplace.

Amazon Standard Identification Number

http://en.wikipedia.org/wiki/Amazon_Standard_Identification_Number