Writing, although not very widespread in pre-Islamic time, was well-known among the Arabs. The script used in the seventh century, i. e . during the lifetime of the Prophet Muhammad, consisted of very basic symbols, which expressed only the consonantal structure of a word, and even that with much ambiguity.

While today letters such as ba, ta, tha, ya, are easily distinguished by points, this was not so in the early days and all these letters used to be written simply as a straight line.

From this very basic system of writing there developed over the ages, various types of script, such as Kufi, Maghribi, Naskh, etc., which spread all over the world.

The later invention of printing with standardised types has contributed to formalising the writing.

However, as far as the actual script of the Qur'an is concerned, there were two important steps which brought about the forms in which we have the Qur'anic text as it is today. These were the introduction of:

 Vowelling marks (tashkil).

 Diacritical marks (i'jam).

Tashkil is the name for the signs indicating the vowels in Arabic scripts. They were apparently unknown in pre-lslamic times. These signs help to determine the correct pronunciation of the word and to avoid mistakes.

Example: Byt Baitun When more and more Muslims of non-Arab origin and also many ignorant Arabs' [Yaqut reports in his book irshad that al- Hajjaj b. Yusuf himself once read ahabba in 9: 24 wrongly as ahabbu, see GdQ. 111, 124, note 6.] studied the Qur'an, faulty pronunciation and wrong readings began to increase. It is related that at the time of Du'all (d. 69H/638) someone in Basra read the following aya from the Qur'an in a faulty way, which changed the meaning completely: :