PW

Pacific Western Airlines; IATA code PW, an airline that merged into Canadian Airlines International

Pacific Western Transportation;(PW) or (PWT) A Bus Company, based out of Toronto, with its headquarters in Calgary

Piggly Wiggly, a U.S. supermarket chain

Pratt & Whitney, an aircraft engine manufacturer

The IATA code for Precision Air based in Tanzania

Pennywise, an American punk band

Perfect World, a 3D MMORPG game developed by Beijing Perfect World

Persistent world, a term used in online role-playing games

Peter Wiggin, a character in the Ender's Game series by Orson Scott Card

Philadelphia Weekly, a tabloid newspaper

Petawatt, a unit of power

Pennyweight; (PW) or (PWT), a pennyweight - a small unit of mass

Picowatt, a unit used for measuring noise levels, commonly abbreviated pW

Pauly-Wissowa, a German encyclopedia of classical scholarship

Publishers Weekly, a magazine covering the book publishing industry

Palau, an island nation in the Pacific Ocean; Palau's postal abbreviation is PW

Puerto Williams a port on Tierra del Fuego

Prince of Wales Secondary School in Vancouver, BC

Politechnika Warszawska, the Warsaw University of Technology, in Poland

Professional Wrestling - Professional wrestling, or pro wrestling, is a form of theatre which contains strong elements of mock combat and catch wrestling.

Pseudo-wire, an emulation of a native service over a Packet Switched Network

Potable water; in plumbing, "PW" is used as a rating on pipes and fittings, meaning that they can be used for potable water, and are pressure rated

Pieter Willem Botha, President of South Africa from 1984-1989. Was commonly known as PW

Paul Wilson (musician), bass guitarist for Snow Patrol

Power window, an automobile window which is raised and lowered by a switch

Prader-Willi Syndrome, a genetic disorder