The national flag of Turkey, officially the Turkish flag (Turkish: Türk bayrağı), features a white crescent and star in a red background on its emblem, based on the 18th-century flag of the Ottoman Empire. The flag is often called "the red flag" (al bayrak), and is referred to as "the red banner" (al sancak) in the Turkish national anthem. The measures, geometric proportions, and exact tone of red of the flag of Turkey were legally standardized with the Turkish Flag Law on 29 May 1936. Wikipedia