vanity license plate

/V AE1 N AH0 T IY0 L AY0 S AH0 N S P L EY0 T/
noun
  1. 1

    A license plate whose identifier is chosen by the registering owner, typically to spell out an abbreviated word or phrase.

Synonyms

Source: https://en.wiktionary.org/wiki/vanity%20license%20plate