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The pica is a typographic unit of measure corresponding to approximately 1⁄6 of an inch, or 1⁄72 of a foot. One pica is further divided into 12 points.
The millimetre (International spelling as used by the International Bureau of Weights and Measures; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length. Therefore there are thousand millimetres in a metre. There are ten millimetres in a centimetre.