RhymeZone: sipp definitions

Definitions of Sipp:

name: A surname (common: 1 in 100000 families; popularity rank in the U.S.: #15996)

noun: A surname.
noun: (travel, car hire) Acronym of standard interline passenger procedure. A series of four-letter codes used to indicate a type of vehicle.
noun: (UK, pensions) Acronym of self-invested personal pension.

(Definitions from Wiktionary)