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by masklinn 3369 days ago
> It doesn't even save a byte at typical font sizes: 20q == 5mm.

Typographers apparently use sub-millimeter precision for their sizes e.g. across 9 use cases Aicher had a single integral-millimiter font size[0]. The quarter-mm seems to have been the base multiplier suggested by DIN 16507-2, though it apparently also suggests 0.1 or 0.05mm when even more precision is necessary.

[0] https://en.wikipedia.org/wiki/Metric_typographic_units