The abbreviation PM, which stands for post meridiem is used to label the times between noon and midnight. It is a Latin phrase that means "after noon."
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A sundial is an instrument that shows the time of day by the shadow of a pointer on a flat surface. Sundials were used to keep time before mechanical clocks were invented. This photo shows a "human sundial" installed in a schoolyard in Lafayette, Louisiana.
Also written as P.M., pm, and p.m.
See also AM.