The flag of the Libyan Arab Jamahiriya was adopted on 11 November 1977 and consisted of a green field. It was the only national flag in the world with just one color and no design, insignia, or other details. It was chosen by Libyan leader Muammar Gaddafi to symbolize his political philosophy (after his Green Book).
The green colour traditionally symbolises Islam, reflecting the historical green banners of the Fatimid Caliphate. In Libya, green was also a colour traditionally used to represent the Tripolitania region.
This flag was used to commemorate the victory of the Green Team during the Steam Summer Sale.