This study investigates a new writing system based on the Roman script that has been used by Israeli Arabs in Israel for about ten years. This system is associated with instant messaging (IM); people usually use it when sending SMSs or when utilizing any of the computer-mediated communication forms, such as Messenger. The paper focuses on the systematization and the typology of this writing system based on data collected from about 40 participants studying in the same school. The results show that most of the participants have used this system systematically, and that this system can be classified as a developing alphabet.