In Naskh script, for example, the alif is five dots high. In Thuluth script, the alif is nine dots high with a crochet or hook of three dots at the top. A single character, which is the fundamental element in calligraphic writing, has a head, body and tail. The characters of calligraphic script also are interrelated with relationships of position, direction and interval. An interplay of curves and uprights, write Khatibi and Sijelmassi, articulate the words, vowels and points.