What is "picometre"

alt. 10^-12 of a metre. Symbol: pm n. 10^-12 of a metre. Symbol: pm

n. a metric unit of length equal to one trillionth of a meter [syn: picometer, micromicron]

The picometre ( International spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer ( American spelling) is a unit of length in the metric system, equal to , or one trillionth of a metre, which is the SI base unit of length.

The picometre is one millionth of a micrometre (also known as a micron), and used to be called micromicron, stigma, or bicron. The symbol µµ was once used for it. It is also one hundredth of an angstrom, an internationally recognised (but non-SI) unit of length.