Serbian (, ) is the standardized variety of the Serbo-Croatian language mainly used by Serbs. It is the official and national language of Serbia, one of the three official languages of Bosnia and Herzegovina and co-official in Montenegro and Kosovo. It is a recognized minority language in Croatia, North Macedonia, Romania, Hungary, Slovakia, and the Czech Republic. Standard Serbian is based on the most widespread dialect of Serbo-Croatian, Shtokavian (more specifically on the dialects of Šumadija-Vojvodina and Eastern Herzegovina), which is also the basis of standard Croatian, Bosnian, and Montenegrin varieties and therefore the Declaration on the Common Language of Croats, Bosniaks, Serbs, and Montenegrins was issued in 2017. The other dialect spoken by Serbs is Torlakian in southeastern Serbia, which is transitional to Macedonian and Bulgarian. Serbian is practically the only European standard language whose speakers are fully functionally digraphic, using both Cyrillic and Latin alphabets. The Serbian Cyrillic alphabet was devised in 1814 by Serbian linguist Vuk Karadžić, who created it based on phonemic principles. The Latin alphabet used for Serbian () was designed by the Croatian linguist Ljudevit Gaj in the 1830s based on the Czech system with a one-to-one grapheme-phoneme correlation between the Cyrillic and Latin orthographies, resulting in a parallel system. Classification Serbian is a standardized variety of Serbo-Croatian, a Slavic language (Indo-European), of the South Slavic subgroup. Other standardized forms of Serbo-Croatian are Bosnian, Croatian, and Montenegrin. "An examination of all the major 'levels' of language shows that BCS is clearly a single language with a single grammatical system." It has lower intelligibility with the Eastern South Slavic languages Bulgarian and Macedonian, than with Slovene (Slovene is part of the Western South Slavic subgroup, but there are still significant differences in vocabulary, grammar and pronunciation to the standardized forms of Serbo-Croatian, although it is closer to the Kajkavian and Chakavian dialects of Serbo-Croatian). Geographic distribution Figures of speakers according to countries: Serbia: 6,540,699 (official language) Bosnia and Herzegovina: 1,086,027 (co-official language) Germany: 568,240 Austria: 350,000 Montenegro: 265,890 (language in official use) Switzerland: 186,000 United States: 172,874 Sweden: 120,000 Italy: 106,498 Kosovo: est. 70.000–100.000 (co-official language) Canada: 72,690 Australia: 55,114 Croatia: 52,879 (recognized minority language) Slovenia: 38,964 North Macedonia: 24,773 (recognized minority language) Romania: 22,518 (recognized minority language) Status in Montenegro Serbian was the official language of Montenegro until October 2007 when the new Constitution of Montenegro replaced the Constitution of 1992. Amid opposition from