PIN code often just PIN (so also in German; more rarely personal identification number)

Abbreviation for Personal Identification Number; a personal and confidential numerical and/or letter code which the user of a payment instrument may need to use in order to verify his/her identity. In electronic transactions, the PIN is legally seen as the equivalent of a personal signature. – See Pay per touch, character signature. – Cf. Deutsche Bundesbank Monthly Report of December 2006, p. 100 f. (PIN security in card transactions).

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