The Kufic (كوفي) script, according to Wikipedia:
Kufic is a form of script consisting of straight lines and angles, often with elongated verticals and horizontals. It originally did not have consonant pointing distinguishing, for example, b, t, and th. It is still employed in Islamic countries though it has undergone a number of alterations over the years and also displays regional differences. The difference between the Kufic script used in the Arabian Peninsula and that employed in North African states is very marked.
The name Kufic is derived from the city of Kufa (الكوفة), Iraq. Kufic is the oldest calligraphic form of the Arabic script and was prevalent in manuscripts from the 8th-1th centuries. It is in this script that the first copies of the Qur'an were written. Modern day usage of Kufic script include logos, letterhead and monograms.
It is notable that imitations of the Kufic script were made in European art (in a non-Arabic context) during the Middle-Ages and Renaissance. This became to be known as Pseudo-Kufic, or Kufesque.