Crescent and Star

Crescent and Star
The Crescent moon, often with a five or six pointed star, became a prominent symbol for Islam early in the 19th century.
www.rochester.edu/College/REL/symbols/crescent.html

Crescent Moon: Symbol of Islam? - about.com
What is the history of the crescent moon symbol, and how did it come to be associated with Islam?
islam.about.com/library/weekly/aa060401a.htm

Republic of Turkey
Red flag with a white crescent and star.
www.allstates-flag.com/fotw/flags/tr.html

Search For the Origin of the Crescent and Star Motif in the Turkish Flag
The word "crescent" is associated with the moon and is used to describe the moon's shape in its early phase of the first quarter.
www.compmore.net/~tntr/crescent_stara.html

Star and Crescent Symbol
Contrary to popular belief, the symbol is not Muslim in origin. Rather, it was a polytheistic icon adopted during the spread of Islam, and its use today is sometimes controversial in the Muslim world.
www.religionfacts.com/islam/symbols.htm