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O or Oh (majuscule: Օ, minuscule: օ, Armenian: օ) is the 38th letter of the reformed Armenian alphabet and the 37th letter of the classical Armenian alphabet. This letter was first noticed in a text from the year 1046 at the work փափագանօք (p'ap'aganok').
Unlike many Armenian letters, O has no numeric value.
С. Гюлбудагян. (1986). "Орфография" . Армянская советская энциклопедия (in Russian). Vol. 12. Yerevan. p. 242.{{cite book}}: CS1 maint: location missing publisher (link)
Э. Г. Туманян. (1990). "Армянское письмо". Советская энциклопедия (in Russian) (Лингвистический энциклопедический словарь ed.). Moscow. Archived from the original on 2021-12-31.