The flag uses the same symbols of the former Ottoman flag, adopted in 1844 with the Tanzimat reforms in the Ottoman Empire. The geometric proportions of the flag were legally standardised with the Turkish Flag Law in 1936 during the republic period of Turkey.
The current design of the Turkish flag is directly derived from the late Ottoman flag, which had acquired its final form in 1844. Its measures have passed by a law during the Republic period on May 29, 1936 which formed the shapes and measures of the current flag of the Republic of Turkey.
Ottomans used several different designs, most of them featuring one or more crescents, for different purposes, such as the flag with green background signifying the caliphate. During the late imperial period, the distinctive use of the color red for secular and green for religious institutions became an established practice.
In 1844, the eight-pointed star was replaced with a five-pointed star and the flag reached the form of the present Turkish flag; Red was the colour ofUmar I, the Caliph who ruled from AD 634 to 644 and was known as a great consolidator of the Islamic Empire. In the 14th century red became the colour of the Ottoman Empire.