The Flag of Iran has square kufic script.
From wikipedia:
"...writing on the borders between the white, and the green and red bands reading, Allahu Akbar ("God is great") in a stylized version of the Kufic script used for the Qur'an. There are 22 (2×11) copies of this inscription, symbolic of the 22nd day of the 11th month (Bahman) in the Persian calendar—the date of the Islamic revolution (22 Bahman 1357 = February 11, 1979) over the Pahlavi dynasty. The addition of this writing renders the flag non-reversible.
Source: http://en.wikipedia.org/wiki/Iranian_flag
Source:
Flagspot.net
