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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.

SI prefixes

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(Sub)multiple Prefix Symbol Short scale Name Long scale Name
1024 yotta Y Septillion Quadrillion
1021 zetta Z Sextillion Thousand trillion (Trilliard)
1018 exa E Quintillion Trillion
1015 peta P Quadrillion Thousand billion ( Billiard)
1012 tera T Trillion Billion
109 giga G Billion Thousand million ( Milliard)
106 mega M Million
103 kilo k Thousand
102 hecto h Hundred
101 deca da Ten
10-1 deci d Tenth
10-2 centi c Hundredth
10-3 milli m Thousandth
10-6 micro µ Millionth
10-9 nano n Billionth Milliardth
10-12 pico p Trillionth Billionth
10-15 femto f Quadrillionth Billiardth
10-18 atto a Quintillionth Trillionth
10-21 zepto z Sextillionth Trilliardth
10-24 yocto y Septillionth Quadrillionth



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Topics: Attorney General, Attorney/client Privilege, Attorney General...

AttorneyAn attorney is someone who represents someone else in the transaction of business: For attorney-at-law see lawyer, solicitor, barrister or civil law notary. For attorney-in-fact see power of attorney.Attorney GeneralIn most common law jurisdictions, the Attorney General is the main legal adviser to the government, and in some jurisdictions may in addition have executive responsibility for law enforcement or responsibility for public prosecutions. Australia In AustralAttoAtto (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. spelling attometer). Adopted in 1964, it comes from the Danish atten meaning eighteen''. See also SI prefix attometre att
Attorney/client privilegeAttorney/Client Privilege is a law that protects communications between attorneys and their clients and keeps them confidential. This privilege encourages open and honest communication between attorneys and their clients because attorneys cannot reveal (aAttorney General for England and WalesHer Majesty's Attorney General for England and Wales usually known as the Attorney General is the chief legal adviser of the Crown in England and Wales. He represents the Queen and the Government in court, and has supervisory powers over prosecutions, whiAttorney-General of IrelandThe Attorney General ( Irish: An Ard-Aighne is the official adviser to the Irish Government in matters of law. He is in effect the chief law officer in the Republic of Ireland. The Attorney-General is not a member of the Government but does participate in
Attorney General of AustraliaAttometreAttosecond
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