The Collaborative Market Data Network -
serving the Public interest of Transparency in Debt Capital Markets
The Collaborative Market Data Network
Serving Transparency in Capital Markets
The Collaborative
Market Data Network

Dictionary

ISIN

An International Securities Identification Number (ISIN) uniquely identifies a security. Its structure is defined in ISO 6166. Securities for which ISINs are issued include bonds, notes, certificates of deposit, commercial paper, stocks and warrants. The ISIN code is a 12-character alpha-numerical code that does not contain information characterizing financial instruments but serves for uniform identification of a security at trading and settlement. 

Wikipedia: http://en.wikipedia.org/wiki/International_Securities_Identification_Number