'Tis all a chequer-board of nights and days
Where the destiny of men for pieces plays:
Hither and thither moves, and mates, and slays,
And one by one back in the closet lays.
- - Rubiyat of Omar Khayyam
Arabic Tanwin
This document lists the three different forms of the Tanwin, which are nominal and adjectival suffixes. The Tanwin is typically found in the Qur'an, the holy text of Islam. While they are pronounced while formally reciting the Qur'an, they are normally not pronounced when speaking informally.
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For more information, I highly recommend also reading the article at the following URL: http://en.wikipedia.org/wiki/Arabic_grammar