ISIN

Also: International Securities Identification Number

An ISIN (International Securities Identification Number) is a twelve-character alphanumeric code that uniquely identifies any tradable security worldwide. It starts with a two-letter country code (e.g., DE for Germany, US for the United States), followed by a nine-digit national number and a check digit. Investors use ISINs to identify stocks, bonds, and ETFs unambiguously across brokers and jurisdictions.