República Socialista Soviética de Tayikistán
In Tajikistan and other countries of the former Soviet Union, Tajik Persian is currently written in Cyrillic script, although it was written in the Latin script beginning in 1928 and the Arabic alphabet prior to 1928. In the Tajik Soviet Socialist Republic, the use of the Latin script was later replaced in 1939 by the Cyrillic script. The Tajik alphabet added six additional letters to the Cyrillic script inventory and these additional letters are distinguished in the Tajik orthography by the use of diacritics.