High Quality Content by WIKIPEDIA articles! In sociolinguistics, digraphia refers to the use of more than one writing system for the same language. Some scholars differentiate between synchronic digraphia with the coexistence of two or more writing systems for the same language and diachronic (or sequential) digraphia with the replacement of one writing system by another for a particular language. An example of synchronic digraphia is Hindi-Urdu, which is written in the Devanagari script (mostly in India) or the Perso-Arabic script (mostly in Pakistan); an example of diachronic digraphia is Turkish, which replaced an Arabic-based writing system with a Latin-based system in 1928. Digraphia has implications in language planning, language policy, and language ideology.