The French Carte Nationale d'Identité Sécurisée (CNI or CNIS) is the French national identity card. It's an official identity document consisting of a 12-digit identification number. This number is commonly used when opening bank accounts and when paying by check. It can sometimes be used instead of a passport or visa within the European Union (EU) and in some other countries.

The French Numéro d'Inscription au Répertoire (NIR) is a permanent personal identification number that's also known as the French social security number for services including healthcare and pensions.

A French passport number.