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SI prefix

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An SI prefix is a prefix, that, when applied to a word, means to multiply that word by a particular power of ten.[1] Examples of applications of SI prefixes include kilometer, megapixel, and gigabyte.

The standard large and small SI prefixes are given below.

Name Value Factor/Divider Name Value
deca- 10 ten deci- 0.1
hecto- 100 hundred centi- 0.01
kilo- 1000 thousand milli- 0.001
mega- 106 million micro- 10-6
giga- 109 billion nano- 10-9
tera- 1012 trillion pico- 10-12
peta- 1015 quadrillion femto- 10-15
exa- 1018 quintillion atto- 10-18
zetta- 1021 sextillion zepto- 10-21
yotta- 1024 septillion yocto- 10-24

Extensions Edit

Andre Joyce's extension Edit

Andre Joyce fabricated an extension to the system,[2] noting that zetta and yotta seem related to sette (Italian "seven") and otto (Italian "eight.") Following the reverse-alphabet pattern, we have xova- \(= 10^{27}\), x + nove, and weica- \(= 10^{30}\), w + dieci. (The last letter has been changed to a to keep the pattern.) The pattern for the corresponding negative exponents, like deci-, centi-, and milli-, all end in -i.

From here, only the first syllable of the Italian number is used. We have:

  • vunda- = \(10^{33}\), v + und(ici), vundi- = \(10^{-33}\)
  • uda- = \(10^{36}\), u + (do)d(ici), udi- = \(10^{-36}\)
  • treda- = \(10^{39}\), t + tred(ici), tredi- = \(10^{-39}\)
  • satta- = \(10^{42}\), s + (qu)att(ordici), satti- = \(10^{-42}\)
  • rinda- = \(10^{45}\), r + (qu)ind(ici), rindi- = \(10^{-45}\)
  • qeda- = \(10^{48}\), q + (s)ed(ici), qedi- = \(10^{-48}\)
  • pica- = \(10^{51}\), p + (d)ic(iasetta), pici- = \(10^{-51}\)
  • oca- = \(10^{54}\), o + (di)c(iotto), oci- = \(10^{-54}\)
  • nica- = \(10^{57}\), n + (di)c(iannove), nici- = \(10^{-57}\)
  • menta- = \(10^{60}\), m + (v)ent(i), menti- = \(10^{-60}\)

The system continues to zotta- = \(10^{255}\) and zotti- = \(10^{-255}\).

Jim Blowers' extension Edit

Initially Jim Blowers, like Andre Joyce, followed reverse-alphabet pattern and extends his system up to vigintillion:

  • xona- = 1027
  • weka- = 1030
  • vunda- = 1033
  • uda- = 1036
  • treda- = 1039
  • sorta- = 1042
  • rinta- = 1045
  • quexa- = 1048
  • pepta- = 1051
  • ocha- = 1054
  • nena- = 1057
  • minga- = 1060
  • luma- = 1063

However, recently he changed this system and proposed his own system of prefixes up to 103000. Here is a list of his prefixes:[3]

Hella-extension Edit

Austin Sendek, a University of California student, started a (somewhat jocular) Facebook petition to make "hella-" the official SI prefix for 1027.[4][5] "Hella" is a slang term originating out of Northern California, meaning "a lot of" or "very". The term has not become official, but both Google and Wolfram|Alpha have adopted it into their calculator systems.[6]

Other extensions Edit

There are many other extensions to the SI prefixes, which are listed on the wiki's articles on extended SI prefixes - for example, see the article Prefix 10^27.

Sources Edit

  1. [1]
  2. [2]
  3. [3]
  4. The Official Petition to Establish Hella as the SI Prefix for 10^27
  5. Google gets behind 'hella' campaign
  6. Google and Wolfram|Alpha examples

See also Edit

Googological affixes

Suffixes: -teen · -ty · -plex · -illion · -yllion · -chime · -toll · -gong · -bong · -throng
Prefixes: gar- · fz- · fuga- · megafuga- · booga-
SI prefixes: deca- · hecto- · kilo- · mega- · giga- · tera- · peta- · exa- · zetta- · yotta-
Obsolete SI prefixes: myria-
Extended SI prefixes: 666 · 105 · 107 · 1027 · 1030 · 1033 · 1036 · 1039 · 1042 · 1045 · 1048 · 1051 · 1054 · 1057 · 1060 · 1063 · 1090 · 10100 · 10120 · 10150 · 10180 · 10210 · 10240 · 10270 · 10300 · 10600 · 10900 · 101200 · 101500 · 101800 · 102100 · 102400 · 102700 · 103000 and higher

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