PWC

A personal watercraft (PWC) is a power-driven vessel that:

(a) has a fully enclosed hull, and
(b) does not retain water taken on if it capsizes, and
(c) is designed to be operated by a person standing, sitting astride or kneeling on the vessel but not seated within the vessel.

PWC are often referred to by the brand name including Jet Ski, Sea-Doo and Waverunner.