In typography, a counter is the area of a letter that is entirely or partially enclosed by a letter form or a symbol (the counter-space/the hole of). 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. An aperture is the opening between the counter and the outside of the letter.
Open and closed apertures
Different typeface styles have different tendencies to use open or more closed apertures. This design decision is particularly important for sans-serif typefaces, which can have very wide strokes making the apertures very narrow indeed.
Fonts designed for legibility at small sizes often have very open apertures, keeping the strokes widely separated from one another to reduce ambiguity; this may be especially important for printing on poor-quality paper on which the ink may spread out. Fonts with open apertures include Lucida Grande, Trebuchet MS, Corbel and Droid Sans, all designed for use on low-resolution displays, and Frutiger, FF Meta and others designed for print use. This design trend has become increasingly common with the spread of humanist sans-serif designs since the 1980s and the 1990s and the use of computers requiring new fonts which are legible on-screen.
Realist or neo-grotesque sans-serif fonts like Helvetica use very closed apertures, folding up stroke ends to make them closer together. This gives these designs a distinctive, compact appearance, but may make similar letterforms hard to distinguish. Closed letterforms on highly condensed realist designs such as Impact and Haettenschweiler make characters such as 8 and 9 almost indistinguishable at small print sizes.
- Maxymuk, John (1997). Using desktop publishing to create newsletters, handouts, and Web pages (Google books (snippet view)). Neal-Schuman. p. 33. ISBN 978-1-55570-265-6. Retrieved July 19, 2009.
Counter is the white space center of enclosed letters like Bb, Dd, Pp.
- Narang, Sumita (2006). Designing Websites: According to the Ancient Science of Directions (Google books (limited prview)). Smita Jain Narang. p. 74. ISBN 978-81-207-3071-7. Retrieved July 19, 2009.
Open space in a letter is called the counter or the aperture.
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- Whited, Billy. "Three Exemplary Typefaces for User Interfaces". The Typekit Blog. Adobe. Retrieved 28 November 2014.
- Covert, Adrian. "Why Apple's New Font Won't Work On Your Desktop". FastCoDesign. Retrieved 28 November 2014.
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