x-height
In typography, the x-height, or corpus size, is the distance between the baseline and the mean line of lower-case letters in a typeface. Typically, this is the height of the letter x in the font (the source of the term), as well as the v, w, and z. (Curved letters such as a, c, e, m, n, o, r, s, and u tend to exceed the x-height slightly, due to overshoot.) One of the most important dimensions of a font, x-height is used to define how high lower-case letters are compared to upper-case letters.
xの高さに収まってる文字
v
w
x
z
曲線を含む文字は、xの高さを超える傾向がある
a
c
e
m
n
o
r
s
u
ascenderがある(上にとびでてる)
b
d
f
h
i
k
l
t
descenderがある(下に飛び出てる)
g
p
q
y
ascenderもdescenderもある?
j