>> Your point being...?
> 
> "In metal type, the point size (and hence the em) is measured as the 
> height of the metal body from which the letter rises."

I knew that. ;-)

> "In digital type, the relationship of the height of particular letters 
> to the em is arbitrarily set by the typeface designer."

In other words, given a 10pt font, there is no way to determine how tall 
or wide any of the letters are. (E.g., they could be 10pt, 1pt, 
1000pt...) This is very helpful. :-/

>> Last time I checked, PostScript measures everything in points.
> 
> With the "point size" corresponding to the em. In a 10pt font, one em 
> equals 10 points. The actual height of most letters will be smaller.

Still doesn't help me figure out how wide the letters of Courier 10pt 
are. (Being a monospace font, all the letters should be the same width...)

As I say, it appears to be exactly 6pt. But I have no idea why...

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