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Aren't (lower-case) "e" and (upper-case) "A" examples of letters with both open and closed counters ? There's an open and an enclosed area to each of them. —Preceding unsigned comment added by 188.8.131.52 (talk) 17:37, 4 July 2008 (UTC)
In my book 'Fonts and Encodings', O'Reilly 2007. Pg. 4:
The counter, which is the inner part of a letter, for example, the space inside an 'o' and 'O', a 'D', etc. The counter of an 'e' is commonly called an eye. When the letter is open at one end, as is the case with 'n' we speak instead of an aperture.
- How curved does the relevant part of a glyph have to be in order to be considered an aperature? Certainly, 'c' makes sense because it is like only a minorly broken-open 'o', and it also makes sense that the pipe | would not be considered to have an aperture, but what about the parenthesis ( ?
- Arlo James Barnes 06:23, 24 May 2014 (UTC)