The Arabic Alphabet has 28 letters. The shape of these letters changes depending on their position in the word, whether isolated; in the beginning of the word (initial); in the middle (medial); or at the end (final). http://www.sakkal.com/Arab_Calligraphy_Art1.html
Square Kufic Script Form of the letters in square kufic Table of the square kufic script letters with their modern Arabic equivalents. Note that many of the characters have the same form and can be easily confused.