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The standard SI prefix system only extends to yotta- = 1024. A number of extended prefixes have been proposed for the next power of 1,000, 1027 (octillion). A common choice is a prefix starting with the letter X, extrapolating from the previous two prefixes, which have initials Z and Y respectively.

Prefix Symbol Reciprocal Symbol Source
Nina- N Ninto- n[note 1] By Jim Blowers[1]
Xenna- X Xento- x By Sbiis Saibian[2] and Jonathan Bowers[3], independently
Novetta- No Novemo- no By Robert Munafo[4]
Umpty- U In Sandcastle Builder[5]
Xona- X Xonto- x In Blowers' old system[6]
Xova- Xovi- By André Joyce[7]
Nova- Novo- By Aarex Tiaokhiao[8]
Bronta- B Brimto- b By Cookie Fonster[9]
Harpi- HA Harpo- ha By Morgan Burke (after Harpo Marx)
Bronto- B By Lawrence Hollom, and very often on the Internet[10]
Xenta- X Xenno- x By Jeff K. Aronson
Nea- N Syto- s By Alex Lopez-Ortiz
Nova- N Novo- n[note 1] By Gerard Michon
Xotta- Xocto- By H. Paul Shuch
Xina- X Xito- x In Aarex's old system[11]
Hella- By Austin Sendek[12][13][14] (from Northern California slang "hella")
Xera- X In a Wikipedia-originated hoax notable for an appearance in the New York Times[15]

Notes

  1. 1.0 1.1 Conflicts with the symbol for nano-

Sources

  1. Extension of SI prefix system by Jim Blowers
  2. SEPS
  3. Illion Numbers
  4. EMPS
  5. Sandcastle Builder
  6. Non-Canonical SI Prefixes
  7. André Joyce's Googology page
  8. [1]
  9. Pointless Large Number Stuff
  10. Extremely Big Numbers
  11. [2]
  12. The Official Petition to Establish Hella as the SI Prefix for 10^27
  13. Google gets behind 'hella' campaign
  14. Google and Wolfram|Alpha examples
  15. Military Computer Sets Record - New York Times

See also

Googological affixes

Suffixes: -teen · -ty · -plex · -illion · -yllion · -exian · -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