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May 2, 2016 at 17:59 comment added egreg @user1129682 <backquote>A is TeX lingo for an “alphabetical constant”: it denotes the ASCII code of the letter A. \fontcharht must be followed by a font specifier (\font stands for the current one) and by a number denoting the slot in the font. In this case, the slot corresponding to an A.
May 2, 2016 at 17:49 comment added Bananguin What does the character between \font and A do in this construct? I'm having trouble making Google yield good results on it.
Oct 28, 2015 at 12:55 history edited egreg CC BY-SA 3.0
Final comment
Oct 28, 2015 at 12:52 vote accept ManuelAtWork
Oct 28, 2015 at 12:32 comment added egreg @barbarabeeton In several fonts (CM included), the height of A and of T or X are the same, even if the A glyph slightly overshoots.
Oct 28, 2015 at 12:26 comment added barbara beeton oh, golly, you too? look at a few fonts. not all "A"s are flat on top, and sometimes that point exceeds the designed cap height. i cant think of any (roman) fonts that have ah "X" or "H" with excrescences at the top.
Oct 28, 2015 at 12:14 history answered egreg CC BY-SA 3.0