atto- [A toh] (Danish or Norwegian: eighteen; a decimal prefix used in the international metric system for measurements).This prefix is used in the metric [decimal] system as quintillionth [U.S.] and trillionth part [U.K.], 10-18 [0.000 000 000 000 000 001]. The metric symbol for atto- is a.attoampere:
attogram:
attosecond:
attotesla:
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