Personal Identification Number definition in Computer Security terms:
Definition(s): A secret that a cardholder memorizes and uses to authenticate his or her identity.
Source(s): FIPS 201-2
An alphanumeric code or password used to authenticate an identity.
Source(s): FIPS 140-2
A password consisting only of decimal digits.
Source(s): NIST SP 800-63-2
reference: CSRC Glossary