The youth in Egypt ,and in almost in all the Arabic countris,have developped a sppecial orthograph system enabling them to write Arabic in Latin letters.We call that in Egypt:Franco-Arabic although this system has no relation with French language.Surely there're some letters in Arabic which don't have equivalent in English.So we substitute them with numbers as followed: أ A Bب Tت thث جg ح7 5خ دD ذth رR زz سS شsh صS ضD ط6 6'ظ 3ع 3' غ فF قK كK ل L مM ن N هH و W ىY

FRANCO that is what we call it most importantly are the numbers shown in ahmed's answer 3 5 7 6 some people hate it & can't read arabic written that way others find it faster to type than the arabic keywords themselves :)

this is nothing. you can't writte arabic with latin letters, as you can't writte english with arabic letters. there are transcription systems you can look for them in any serious manual about arabic language. This impossibility is due to lack of tradition of using different alphabets for a language. there are some examples of languages that hystorically have been written in different alphabets, or still they are, but this is not the case for arabic (and english). this problem is not specifical of any alphabet but all share this issue. But for instance, japanese has developed a latin scripture called "romanji" because japanese phonetics quite fits to the phonetics represented by latin alphabet, ( of course there is no one to one correspondence as there is no total correspondence between the sound a letter or group represents in all languages that use latin alphabet.

Transliteration is the answer to your question. It is the practice of transcribing a word or text written in one writing system into another writing system or system of rules for such practice. (Source Wikipedia)

Transliteration