Pica (pi or pc) 1
Pica (pi or pc) 1 : A unit of length used by typographers and printers. One pica equals 12 points, 4.22 mm, or a bit less than 1/6 inch. "Pica type" is type that sets six lines to the inch. The origin of this word is not known. In the Catholic Church, a "pica" is a book of daily services, so it is possible that pica type got its name from being used to print picas. The unit is pronounced "pike-ah."
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