Glossary Term Definition
The basic unit of typographic measurement; in the Anglo-American system one point equals approximately 0.3515 mm (1/72.27 inch), while the PostScript point is exactly 1/72 inch.
Definition
The basic unit of typographic measurement. In the Anglo-American system, one point equals approximately 0.3515 mm (1/72.27 inch). The PostScript point, now standard in digital typography, is exactly 1/72 inch (0.3528 mm). Twelve points make one pica.
Source
No access — Robert Bringhurst — p. 328:
The basic unit of typographic measurement.