Tan can mean several things: Tan (color) Tan or tangent, one of the main trigonometric functions; Tanning, the process of making leather from hides
http://en.wikipedia.org/wiki/Tan

Traditional Catholic books and booklets. Books on traditional Catholic doctrine, Jesus Christ, Blessed Virgin Mary, Catholic Church history, lives of the Saints, afterlife ...
http://www.tanbooks.com/

Tan n. [Chin.] See Picul . Tan n. [F. tan , perhaps fr. Armor. tann an oak, oak bar; or of Teutonic origin; cf
http://www.answers.com/topic/tan

Since 1992, TAN, a wholesale priced vacation accommodations program, has helped families and individuals create lifelong vacation memories.
http://www.planwithtan.com/

In the 1950s, many people used baby oil as a method to tan more quickly. The first self-tanner came about in the same decade and was known as ?Man-Tan,? and often led to ...
http://en.wikipedia.org/wiki/Sun_tanning