A porthole, sometimes called bull's-eye window or bull's-eye, is a generally circular window used on the hull of ships to admit light and air. Though the term is of maritime origin, it is also used to describe round windows on armored vehicles, aircraft, automobiles and even spacecraft.

The eleventh generation of the Ford Thunderbird is a two-seat convertible manufactured and marketed by Ford from 2001 to 2005 for model years 2002 through 2005. It followed a five-year hiatus of the Thunderbird after the 1997 discontinuation of its tenth generation.