World Wide Web — also known as WWW or Web.

Warcraft III — also known as Wc3

World Wide Web Consortium - also known as W3C.

W3, the IATA code for Flyhy Cargo Airlines

London W3 — the London postal code area W3.

The Amazing 3, a manga and anime series; the Japanese title is W3.

Feuling W3 — A 3-cylinder motorcycle engine designed by Jim Feuling, owner of Feuling R&D in Ventura, California.[1]