From Wiktionary, the free dictionary
From Armenian թվանշան (tʻvanšan).
тваншан • (tvanšan) (Nij)
- (archaic) grade, mark
- Gukasjan, Vorošil (1974) “тваншан”, in Удинско-азербайджанско-русский словарь [Udi–Azerbaijani–Russian Dictionary][1], Baku: Academy Press, page 203