ISIN stands for International Securities Identification Number (ISIN). It is an international numbering system set up by the International Organization for Standardization (ISO) to number specific securities, such as stocks (equity and preference shares), bonds, options and futures.
ISIN contains 12 characters in total, which comprise of both alphabets and numbers. The first two digits stand for the country code, next nine digits are the unique identification number for the security while the last digit is a check digit to prevent errors.
E.g.: ISIN for State Bank of India (SBI) is INE062A01012.