Standard Arabic Technical Transliteration System

The Standard Arabic Technical Transliteration System, commonly referred to by its acronym SATTS, is a system for writing and transmitting Arabic language text using the one-for-one substitution of ASCII-range characters for the letters of the Arabic alphabet. Unlike more common systems for transliterating Arabic, SATTS does not provide the reader with any more phonetic information than standard Arabic orthography does; that is, it provides the bare Arabic alphabetic spelling with no notation of short vowels, doubled consonants, etc.

Source: Wikipedia — Standard Arabic Technical Transliteration System (CC BY-SA 4.0)