Background
The Latin alphabetic letter employed for each Arabic letter in the SATTS system is its Morse-code equivalent. For example, Morse code for the Arabic letter ţā' (ط) is • • — (dit-dit-dah). That same Morse code sequence represents the letter U in the Latin alphabet. Hence the SATTS equivalent for ţā' is U.
In the Morse-code era, when Arabic language Morse signals were copied down by non-Arab code clerks, the text came out in SATTS. Text in SATTS was also automatically produced when teleprinters reproduced Arabic text, if the technician had failed to replace the printer's Latin-character pallet with an Arabic-character one.
Read more about this topic: Standard Arabic Technical Transliteration System
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