This project has studied the differences in the books of the meanings of characters printed until the end of the eighth century AH , I studied all unilateral characters which concern as scientists to study their meanings , and traced these meanings of the books of thoughtful letters on according to the chronological order of their respective owners, namely 1. Book lettering meanings huroof Al maani Zagagi (d.340 AH). 2.the meanings of the letters By Al Rumaani (d. 384 AH) 3.Book Alozhih in the science of letters of Heravi (d. 415 AH) 4.Book Rasf Al mabani Fi sharh Al maani Al malqiMagay ( d. 702AH) 5. Al Tuhafa Al Wafeiah Bi Maani Huroof Al Arabia AlSafaqsi (d. 742 AH). 6. Jana Al dani Fi huroof Al maani - Almuradi (d.749 AH). 7.Book Mughni Al-labeeb An kutub Al Aaareeb - Ibn Hisham (d. 761 AH) The meaning of each single- character limitation of these books and study what they differed in which a name and a term. Find arranged according to the Alphabetical order of the letters ( Hamza , Alaba , Ta , the Seine , Fa , "KAF", the "Lam", "Mim" , "Noon", Haa , Waw , and Yaa) • Study the differences in the meanings of the books, according to the time it takes precedence • Study the interpretation of evidence of Quranic and poetic as it is more a spin in these books. • Balancing the views of grammarians in unilateral interpretation of the meanings of the letters, by reference to the grammar books and written interpretation of the Qur'an and its sciences, and books readings. • Investigate the meanings of the letters by the owners Who wrote these Book of letters • neglected the meanings of the extra letters of unilateralism. I focused in the issue of rotation of prepositions in the Holy Quran and the compare that the reported difference in the interpretation of the meanings of the letters. • Extracting the meanings of the letters in an illustrative table who mentioned or neglected, and the difference in the terms used for these meanings