TWIP (Twentieth of a Point). A unit of
measure most commonly seen when writing Microsoft printer drivers. It is 1/1440 of an inch, 1/20 of a PostScript
point. There are 72 PostScript points per inch, slightly
different from the printer’s point at 72.27 per inch.
A character printed at 10 pitch (10 characters per inch), is 144 twips wide.
Twips were devised in the olden days when dot matrix printers were constrained to
multiples of either 12 or 10
pitch and this gave a unit of measure that could handle the width of the various
characters the printers could generate on their own.