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AAT ICAS 3107 ✧ prefixMetric term set

document note: this document is part of the Integrated Chronological Applications System (ICAS). Alliance for the Advancement of Technology (AAT) provides ICAS standards documents subject to terms of use described in document AAT ICAS 9010. please refer to other key AAT ICAS standards documents accessible via the AAT ICAS web site at for important information about ICAS.

this document designates the AAT ICAS prefixMetric term set. AAT ICAS Inter-Dial Clock (IDC) chron-unit derived terms and notation are appropriate for fixed implementations of IDC main unit. special note: IDC prefixes are derived from the following schemes each possessing certain usage conventions: metric prefixes (SI prefixes), the derived clock unit prefixes (tik and tok), and from the coordinating expressions 'ten' and 'hundred'. please see AAT ICAS 2023 for additional information.

table 3107.1 ✧ aaticas namespace of prefixMetric

aaticas namespaceelement set
<aaticas:developer>AAT ICAS
<aaticas:metaCat>ICAS metric prefixes

table 3107.2 ✧ AAT ICAS prefixMetric term set

long form coordinating expressions are applied to long form expressions of a principal unit. short form prefix symbols are applied to short form or symbolic expressions of a principal unit. prefix coordinating expressions 'ten' and 'hundred', or derived clock unit terms 'tiko' and 'toko', may be applied to a principal unit in cases of practicable use.
deciddecid1.0 x 10-1 unit submultipleSI
centiccentic1.0 x 10-2 unit submultipleSI
millimmillim1.0 x 10-3 unit submultipleSI
prefix note: 1 tikochron (IDC derived clock-unit prefix) is equal to 10 microchrons (IDC metric prefix)—1 tiXn = 10 μXn.
tokototokoto1.0 x 10-4 unit submultiple'toko' is a derived clock unit prefix appropriate for schematic use
tikotitikoti1.0 x 10-5 unit submultiple'tiko' is a derived clock unit prefix appropriate for schematic use
microμmicroμ1.0 x 10-6 unit submultipleSI
nanonnanon1.0 x 10-9 unit submultipleSI
picoppicop1.0 x 10-12 unit submultipleSI
femtoffemtof1.0 x 10-15 unit submultipleSI
attoaattoaXn1.0 x 10-18 unit submultipleSI
zeptozzeptozXn1.0 x 10-21 unit submultipleSI
yoctoyyoctoyXn1.0 x 10-24 unit submultipleSI
metric usage note:short form expressions of coordinating prefixes for 'ten' and 'hundred' are used in reference to ICAS standards of usage and style.
decadadecada10 unit multipleSI
hectohhectoh100 unit multipleSI
kilokkilok1000 unit multipleSI
ten kiloten-kten kiloten-kcoordinated usage
hundred kilohun-khundred kiloten-kcoordinated usage
coordinating expressions ten and hundred are expressed in symbol form as 'ten' and 'hun' without a hyphen in the case of upper-cased prefix symbols, and with a hyphen in the case of a lower-cased prefix symbol. however uncoordinated expressions of prefixes should otherwise be preferred over coordinated expressions.
megaMmegaM1 000 000 unit multipleSI
ten megatenMten megatenMcoordinated usage
hundred megahunMhundred megahunMcoordinated usage
gigaGgigaG1 000 000 000 unit multipleSI
ten gigatenGten gigatenGcoordinated usage
hundred gigahunGhundred gigahunGcoordinated usage
teraTteraT1.0 x 1012 unit multipleSI
ten teratenTten teratenTcoordinated usage
hundred terahunThundred terahunTcoordinated usage
petaPpetaP1.0 x 1015 unit multipleSI
ten petatenPten petatenPcoordinated usage
hundred petahunPten petahunPcoordinated usage
exaEexaE1.0 x 1018 unit multipleSI
ten exatenEten exatenEcoordinated usage
hundred exahunEhundred exahunEcoordinated usage
zettaZzettaZ1.0 x 1021 unit multipleSI
ten zettatenZten zettatenZcoordinated usage
hundred zettahunZhundred zettahunZcoordinated usage
yottaYyottaY1.0 x 1024 unit multipleSI
ten yottatenYten yottatenYcoordinated usage
hundred yottahunYhundred yottahunYcoordinated usage

top document updated:

system identifiersdatetime
Uniform CalendarUCUCN 12019 S19 Yellow
Inter-Dial ClockIDCzone(UT)t339 tt050
'ICAS in use' can accommodate calendar and clock formatting 'for all people, for all time'.
day of yearD-o-YAD common year day139
Gregorian calendarGG2019 May 19 Sunday
seconds, minutes, hoursSMHUT08:08:14
style legend


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