"The National Flag of Saudi Arabia features a green background with the Shahada or Muslim creed in large white Thuluth script (translated as "There is no god but Allah; Muhammad is the Messenger of Allah") placed above a white horizontal sword, whose tip points to the hoist side of the flag. The flag has an identical design on the obverse and the reverse sides to ensure that the Shahada is read properly from either side of the flag. The green color of the flag honors the country's puritanical Muslim Wahabi sect and also being the favorite color of Prophet Muhammad, it is strongly associated with the religion of Islam. The Shahada is a declaration of faith in Islam. The sword in the flag symbolizes the strictness with which justice is ensured in the country." (source: worldatlas)
