Cyrillic Extended-C characters supported by the Arimo Regular font

Character	Image
CYRILLIC SMALL LETTER ROUNDED VE (U+1C80)
CYRILLIC SMALL LETTER LONG-LEGGED DE (U+1C81)
CYRILLIC SMALL LETTER NARROW O (U+1C82)
CYRILLIC SMALL LETTER WIDE ES (U+1C83)
CYRILLIC SMALL LETTER TALL TE (U+1C84)
CYRILLIC SMALL LETTER THREE-LEGGED TE (U+1C85)
CYRILLIC SMALL LETTER TALL HARD SIGN (U+1C86)
CYRILLIC SMALL LETTER TALL YAT (U+1C87)
CYRILLIC SMALL LETTER UNBLENDED UK (U+1C88)

Count: 9

Character
CYRILLIC CAPITAL LETTER TJE (U+1C89)
CYRILLIC SMALL LETTER TJE (U+1C8A)

Count: 2