Shahr Al -Arf in the art of exchange is a book in the exchange, written by Sheikh Ahmed bin Muhammad Al -Hamlawi Al -Azhari Al -Darwi, and it is one of the books that received great approval by the people of eloquence and the statement, and the linguist Imam, writer Sheikh Tantawi Jawhari in 1894 AD: The book contains three chapters: the door The first: in the verb. Chapter Two: In Speech on the name