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參見：Ꙩ [U+A668 CYRILLIC CAPITAL LETTER MONOCULAR O]、ꙩ [U+A669 CYRILLIC SMALL LETTER MONOCULAR O]、ʘ [U+0298 LATIN LETTER BILABIAL CLICK]、𐍈 [U+10348 GOTHIC LETTER HWAIR]、☉ [U+2609 SUN]、⊙ [U+2299 CIRCLED DOT OPERATOR] 和 ⨀ [U+2A00 N-ARY CIRCLED DOT OPERATOR]