pica (pc or pi)

1. Typographic unit of measure, approximately equal to one-sixth (0.166) of an inch and subdivided into 12 points. Pica is used in expressing horizontal and vertical measurements on a page whereas points are used in expressing font size, character spacing, word spacing, and line spacing.

2. Name of a monospace (having equal space between all adjacent characters) font used commonly in typewriters that prints at a pitch of 10 characters per inch.