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Until November 18, 2022, The standard SI prefix system only extended 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. As of Nov 18, 2022, ronna- has been voted as the official prefix for 1027.

Prefix (1027) Symbol Reciprocal (10-27) Symbol Source
Ronna- R Ronto- r SI prefix
Nina- N Ninto- n[note 1] By Jim Blowers[1]
Xenna- X Xento- x By Sbiis Saibian[2] , Jonathan Bowers[3]
Novetta- No Novemo- no By Robert Munafo[4]
Umpty- U In Sandcastle Builder[5]
Xona- X Xonto- x In Blowers' old system[6]
Xenna- Xento- By NumLynx[7]
Xova- Xovi- By André Joyce[8]
Nova- Novo- By Aarex Tiaokhiao[9]
Bronta- B Brimto- b By Cookie Fonster[10]
Harpi- HA Harpo- ha By Morgan Burke (after Harpo Marx)
Bronto- B By Lawrence Hollom, and very often on the Internet[11]
Xina- X Xito- x In Aarex's old system[12]
Xenta- X Xenno- x By Jeff K. Aronson[13]
Nea- N Syto- s By Alex Lopez-Ortiz[14]
Nova- N Novo- n[note 1] By Gerard Michon[15]
Xotta- Xocto- By H. Paul Shuch[16][17]
Hella- By Austin Sendek[18][19][20] (from Northern California slang "hella")
Xenna- X Xono- By Trakaplex[21]
Xina xovo By MutiSoul[22]
Xera- X In a Wikipedia-originated hoax notable for an appearance in the New York Times[23]
Netta- N Nevo- n By XRQ CORPORATION[24]

Approximation of prefix size[]

Notation Approximation
Scientific notation \(10^{ 27 }\)
Arrow notation \(10\uparrow27\)
Bird's array notation {10,27}
Bowers' Exploding Array Function {10,27}
Hyper-E notation \(E27\)
Chained arrow notation \(10\rightarrow27\)

Notes[]

  1. 1.0 1.1 Conflicts with the symbol for nano-

Sources[]

See also[]

Googological affixes

Suffixes: -teen · -ty · -plex · -illion · -yllion · -exian · -chime · -toll · -gong · -bong · -throng · -illiob
Prefixes: gar- · fz- · fuga- · megafuga- · booga- · trooga- · googo- · googolple-
SI prefixes: deca- · hecto- · kilo- · mega- · giga- · tera- · peta- · exa- · zetta- · yotta- · ronna- · quetta-
Non-SI prefixes: 1.001 · 1.01 · 1.1 · 1.5 · 2 · 3 · 666 · 104 · 105 · 107 · 108 · 1010 · 1011 · 1013 · 1014 · 1016 · 1017 · 1019 · 1020 · 1022 · 1023 · 1025 · 1027 · 1028 · 1029 · 1030 · 1031 · 1032 · 1033 · 1034 · 1035 · 1036 · 1039 · 1042 · 1045 · 1048 · 1050 · 1051 · 1054 · 1057 · 1060 · 1063 · 1066 · 1069 · 1072 · 1075 · 1078 · 1080 · 1081 · 1084 · 1087 · 1090 · 10100 · 10120 · 10150 · 10180 · 10210 · 10240 · 10270 · 10300 · 10600 · 10900 · 101200 · 101500 · 101800 · 102100 · 102400 · 102700 · 103000 and higher

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