ATTO-


'atto-' (symbol 'a') is an SI prefix to an unit and means that it is 10−18 times this unit. Examples are one attosecond or one attometre (U.S. spelling attometer).
Adopted in 1964, it comes from the Danish ''atten'', meaning ''eighteen''.

Contents
See also

See also



★ SI prefix

★ attometre

★ attosecond

★ attoparsec

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