Quelles sont les unités de mesure de TeX ?

Pour $\TeX$ , Il existe 11 unités de longueur, plus une qui n'existe qu'en mode mathématique :

Unité	Nom	Définition	Exemple d'une longueur d'une unité
`sp`	scaled point	La plus petite unité de $\TeX$ . 1 pt = 65536 pt soit 5,4 nm	$\def\unitl#1{\vrule height 3pt depth 0pt width .4pt\vrule height .4pt depth 0pt width #1 \vrule height 3pt depth 0pt width .4pt}\unitl{1sp}$
`pt`	point d'imprimeur (point)	1pt = 1/72,27 in, environ 0,351 mm	$\def\unitl#1{\vrule height 3pt depth 0pt width .4pt\vrule height .4pt depth 0pt width #1 \vrule height 3pt depth 0pt width .4pt}\unitl{1pt}$
`bp`	gros point (big point)	1 bp = 1/72 in	$\def\unitl#1{\vrule height 3pt depth 0pt width .4pt\vrule height .4pt depth 0pt width #1 \vrule height 3pt depth 0pt width .4pt}\unitl{1bp}$
`dd`	didot (Didot point)	1 dd = 1,07 pt, environ 0,376 mm	$\def\unitl#1{\vrule height 3pt depth 0pt width .4pt\vrule height .4pt depth 0pt width #1 \vrule height 3pt depth 0pt width .4pt}\unitl{1dd}$
`mm`	millimètre	1 mm = 0,001 m	$\def\unitl#1{\vrule height 3pt depth 0pt width .4pt\vrule height .4pt depth 0pt width #1 \vrule height 3pt depth 0pt width .4pt}\unitl{1mm}$
`pc`	pica	1 pc = 12 pt	$\def\unitl#1{\vrule height 3pt depth 0pt width .4pt\vrule height .4pt depth 0pt width #1 \vrule height 3pt depth 0pt width .4pt}\unitl{1pc}$
`cc`	cicero	1 cc = 12 dd	$\def\unitl#1{\vrule height 3pt depth 0pt width .4pt\vrule height .4pt depth 0pt width #1 \vrule height 3pt depth 0pt width .4pt}\unitl{1cc}$
`cm`	centimètre	1 cm = 0,01 m	$\def\unitl#1{\vrule height 3pt depth 0pt width .4pt\vrule height .4pt depth 0pt width #1 \vrule height 3pt depth 0pt width .4pt}\unitl{1cm}$
`in`	pouce (inch)	1 in = 25,4mm	$\def\unitl#1{\vrule height 3pt depth 0pt width .4pt\vrule height .4pt depth 0pt width #1 \vrule height 3pt depth 0pt width .4pt}\unitl{1in}$
`ex`	« hauteur d'x »	la hauteur d'un « x » dans la fonte courante	$\def\unitl#1{\vrule height 3pt depth 0pt width .4pt\vrule height .4pt depth 0pt width #1 \vrule height 3pt depth 0pt width .4pt}\unitl{1ex}$
`em`	« largeur d'M »	la largeur d'un « M » dans la fonte courante	$\def\unitl#1{\vrule height 3pt depth 0pt width .4pt\vrule height .4pt depth 0pt width #1 \vrule height 3pt depth 0pt width .4pt}\unitl{1em}$
`mu`	« mu »	unité valable en mode mathématique uniquement, 1 mu = 1/18 em	$\def\unitl#1{\vrule height 3pt depth 0pt width .4pt\vrule height .4pt depth 0pt width #1 \vrule height 3pt depth 0pt width .4pt}\unitl{0.0555em}$