Length can be specified as 3em, or 3.5ex. What is required to make 4en also valid? Are there any other font related length units?

  • What's the use? 1en=0.5em. – Bernard Aug 15 '16 at 9:43
  • and if I wanted \aye for the width of an i? – Yossi Gil Aug 15 '16 at 9:46
  • Why not \fjord for the width of the ligature fj``;o)? – Bernard Aug 15 '16 at 9:53
  • 1
    em is not the width of a character m!!! so your comment about the width of an i seems misplaced, you can use \fontcharwd to find the width of a character in a font. – David Carlisle Aug 15 '16 at 9:55

There is no en unit. TFM fonts have font dimensions 5 and 6 which may be accessed as ex and em no other fontdimen corresponds directly to a unit.


What do different \fontdimen<num> mean

Note in comments you ask about the width of an i you can use e-tex \fontcharwd to find the width of a character or classically \setbox0\hbox{i}... \wd0 But this em and ex are not related to the width or height of the m and x characters they are just arbitrary lengths assigned by the font designer.

  • But there is an \enspace macro, which has sometimes lured me into thinking en is defined as a unit in LaTeX. – alephzero Aug 15 '16 at 12:58
  • there's a \bigskipamount as well but that isn't a unit either, – David Carlisle Aug 15 '16 at 12:59
  • True enough, but en is (or was, historically) a common printing term - often called a "nut" to distinguish it clearly from a "mutton" (em) when speaking. – alephzero Aug 15 '16 at 13:05
  • @alephzero I know:-) but... – David Carlisle Aug 15 '16 at 13:07

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