Allen is a surname, and may refer to many people (reported as #27 in a list of common surnames in the USA http://genealogy.about.com/library/weekly/aa_common_surnames.htm). It is of Scottish origin, coming from aluinn meaning handsomehttp://genealogy.about.com/library/surnames/a/bl_name-ALLEN.htm.
The Allen was an American automobile, built at Forstoria, Ohio between 1913 and 1921. The company used Sommers four-cylinder engines, and acquired that company in 1915. The 1920 Allen 43 was a handsome craft, featuring bevel-sided touring coachwork and a high-shouldered radiator.
"Allen" is the second episode of television series Prison Break which was first broadcast on television on August 29, 2005. The episode is written by series creator Paul Scheuring and directed by Michael Watkins.
A six sided hole in a bolt or screw using an Allen wrench which is a usually a simple L-shaped piece of hex rod but can be a bit or a set of wrenches..
a senior editor, writer, publications designer, and project manager, as well as a scientist, who specializes in biomedical, environmental, and educational publications and Web sites for technical and non-technical audiences