The Flag of Turkey is called Ay Yıldız in Turkish. It means 'moon star'.
The flag has a complex origin since it is an ancient design, being also quite similar to the last flag of the Ottoman Empire, which featured three crescents closely arranged in a triangular formation on a green or red background. The color red is a prominent color in Turkish history, especially regarding the bloody battles of the Turkish War of Independence. The crescent and star, while generally regarded as Islamic symbols today, have for long been used in Asia Minor, quite before the advent of Islam. The flag was originally simply a crescent on a green field, but this was changed in 1793 when Sultan Selim III changed the background to red. In 1844, the star was added. The star symbol actually dates back to the time of Constantine and it was considered a symbol of Mary in his time.
The flag is described according to various legends, the most popular of which include:
See also the Ottoman Flag.
The most widely accepted theory, however, tells of Kemal Ataturk, the founder of the modern Turkish Republic, walking on a battlefield one night after a victorious battle in the Turkish War of Independence, and seeing the reflection of the star and crescent formation, in a large pool of blood on the rocky hill terrain of Sakarya .