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A Helium atom,
having a radius of 31 picometres.

A picometre (American spelling: picometer, symbol pm) is a unit of length in the metric system, equal to one millionth-millionth of a metre, which is the current SI base unit of length. It can be written in scientific notation as 1×10−12 m (engineering notation) or 1 E-12 m (exponential notation) — both meaning 1 m / 1,000,000,000,000.

femtometre <<< picometre <<< nanometre <<< micrometre <<< millimetre < centimetre < decimetre < metre < decametre < hectometre < kilometre

It equals a millionth of a micrometre (formerly called a micron), and was formerly called micromicron or bicron.
It equals a hundredth of an Ångström, an internationally recognized non-SI unit of length.

See also

ca:Picòmeter et:Pikomeetereo:Pikometro eu:Pikometro it:Picometro nl:Picometerno:Picometer nn:Pikometer sk:Pikometer sl:Pikometer sr:Пикометар th:พิโกเมตร