pi·ca 1 
(pīkə)
(pīkə)n.
1.
a. A printer's unit of type size, equal to 12 points or about 1/6 of an inch.
b. An equivalent unit of composition measurement used in determining the dimensions of lines, illustrations, or printed pages.
2. A type size for typewriters, providing ten characters to the inch.
[Probably from Medieval Latin pīca, list of church services (perhaps from the typeface used to print it).]