In typography, a counter or aperture is an area entirely or partially enclosed by a letter form or a symbol (the counter-space/ the hole of).[1][2] Letters containing closed counters include A, B, D, O, P, Q, R, a, b, d, e, g, o, p, and q. Letters containing open counters include c, f, h, i, s etc. The digits 0, 4, 6, 8, and 9 also possess a counter.
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