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See also: ◐ [U+25D0 CIRCLE WITH LEFT HALF BLACK]

◑ U+25D1, ◑ CIRCLE WITH RIGHT HALF BLACK ← ◐ [U+25D0] Geometric Shapes ◒ → [U+25D2]

Translingual

Symbol

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1. contrast (on a television or monitor)
2. first quarter (moon phase)