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  A name assigned through a formal process by a federal department or agency to a federal employee for the purpose of the employee’s protection (i.e., the employee might be placed at risk if their actual name were known) or for other purposes.
FIPS 201-3 under Pseudonym

  A name other than a legal name.
NIST SP 800-63-3 under Pseudonym

  personal identifier that is different from the normally used personal identifier.
NISTIR 8053 from ISO/TS 25237:2008

  1. A subscriber name that has been chosen by the subscriber that is not verified as meaningful by identity proofing.
CNSSI 4009-2015 [Superseded]

  2. An assigned identity that is used to protect an individual’s true identity.
CNSSI 4009-2015 [Superseded]

  A false name. In this document, all unverified names are assumed to be pseudonyms.
NIST SP 800-63-2 [Superseded] under Pseudonym