Atto

From Free net encyclopedia

For the bishop of Vercelli, see Atto (bishop).

atto- (symbol a) is an SI prefix to a 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.

Template:SI prefixes

See also

• SI prefix
• attometre
• attosecond
• attoparsecbr:Ato

ca:Atto cs:Atto es:Atto fr:Atto it:Atto (prefisso) nl:Atto ja:アト no:Atto pl:Atto pt:Atto sl:Ato sr:Ато fi:Atto sv:Atto vi:Atô