13 characters in the Mongolian Supplement Unicode block.
U+11660MONGOLIAN BIRGA WITH ORNAMENTU+11661MONGOLIAN ROTATED BIRGAU+11662MONGOLIAN DOUBLE BIRGA WITH ORNAMENTU+11663MONGOLIAN TRIPLE BIRGA WITH ORNAMENTU+11664MONGOLIAN BIRGA WITH DOUBLE ORNAMENTU+11665MONGOLIAN ROTATED BIRGA WITH ORNAMENTU+11666MONGOLIAN ROTATED BIRGA WITH DOUBLE ORNAMENTU+11667MONGOLIAN INVERTED BIRGAU+11668MONGOLIAN INVERTED BIRGA WITH DOUBLE ORNAMENTU+11669MONGOLIAN SWIRL BIRGAU+1166AMONGOLIAN SWIRL BIRGA WITH ORNAMENTU+1166BMONGOLIAN SWIRL BIRGA WITH DOUBLE ORNAMENTU+1166CMONGOLIAN TURNED SWIRL BIRGA WITH DOUBLE ORNAMENT