The red and white flag of Tunisia, adopted as national flag in 1959.

The flag of Tunisia was, in origin, the naval ensign of the kingdom of Tunis, adopted in 1831 by Al-Husayn II ibn Mahmud. The current official design dates to 1999. The star and crescent recalls the Ottoman flag and is therefore an indication of Tunisia’s history as a part of the Ottoman Empire. Wikipedia

The national flag of Tunisia is a rectangular panel of red color with an aspect ratio of 2:3. In the center of the cloth in a white disk is placed a red crescent, surrounding a red five-pointed star on three sides. The Tunisian Bey Hussein II decided to create a flag for Tunisia, close in appearance to the modern one, after the Battle of Navarino on 20 October 1827; in 1831 he was officially approved. In that form, the flag existed during the French protectorate, and on 1 June 1959, it was proclaimed the state flag of the Republic of Tunisia (in accordance with the Tunisian Constitution). On 30 June 1999, the proportions and design of the flag were clarified by a special law. The general appearance of the flag remained virtually unchanged.

The crescent and the star depicted on the flag of Tunisia are symbols related to the Ottoman Empire and its historic rule of the region. Wikipedia