整理了一下。忘记了也有地方可以查
Math spacing:
| \quad | width of M |
| \! | -3/18 quad |
| \, | 3/18 quad |
| \: | 4/18 quad |
| \; | 5/18 quad |
| \ | 6/18 quad |
| \qquad | 2 quad |
Lengths defined relative to characters:
| em | width of M | |
| ex | width of x | |
| mu | 1 mu = 1/18 em |
Physical lengths (commonly used):
| mm | millimeter | |
| cm | centimeter | |
| in | inch | 1 in = 25.4 mm |
| pt | point | 1 pt = 1/72.27 in |
Physical lengths (not so commonly used):
| bp | big point | 1 bp = 1/72 in |
| pc | pica | 1 pc = 12 pt |
| sp | scaled point | 1 sp = 1/65536 pt |
| dd | didot point | 1 dd = 1238/1157 pt |
| cc | cicero | 1 cc = 12 dd |
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