İske imlâ (Tatar: Иске имля "Old Orthography", pronounced [isˈke imˈlʲæ]) is a variant of the Arabic script, used for the Tatar language before 1920 and the Old Tatar language. This alphabet can be referred to as old only to contrast it with Yaña imlâ. Additional characters that could not be found in Arabic and Persian were borrowed from the Chagatai language. The final alphabet was reformed by Qayum Nasiri in the 1870s. In 1920, it was replaced by the Yaña imlâ (which was not an Abjad, but derived from the same source).