Flag of the United Arab Republic
The Flag of the United Arab Republic (Arabic: علم الجمهورية العربية المتحدة) was adopted following the unification of Egypt and Syria into a single state known as the United Arab Republic on 22 February 1958. Syria left the union on 28 September 1961 following the 1961 Syrian coup d'état.
Source: Wikipedia — Flag of the United Arab Republic (CC BY-SA 4.0)