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Encyclopedia > Myriometre

There exist several unit prefixes used like the SI prefixes, but that are not part of the SI system. An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol) to form a decimal multiple or submultiple. ... Look up si, Si, SI in Wiktionary, the free dictionary. ...


Some of these were never part of any actual system of measurement. A few were proposals that were rejected. None are in common use, and many of the powers of ten they represent are already taken by SI prefixes. Sometimes a prefix is simply mistaken; dk has been passed off as an abbreviation for deka.


One such prefix is bronto, used in the fake term brontobyte. References on the World Wide Web suggest meanings of the bronto prefix to be variously any of 1015, 1021, 1024, or 1027. SI has already produced standard prefixes for 1015 (peta), 1021 (zetta) and 1024 (yotta). In physics and mathematics, peta- (symbol: P) is a prefix in the SI (system of units) denoting 1015, or 1 000 000 000 000 000. ... Zetta (symbol Z) is a SI prefix in the SI (system of units) denoting 1021 or 1 000 000 000 000 000 000 000. ... Yotta (symbol Y) is a SI prefix in the SI (system of units) denoting 1024 or 1 000 000 000 000 000 000 000 000. ...

Contents

Proposed and unofficial prefixes

This article does not cite any references or sources. (December 2006)
Please help improve this article by adding citations to reliable sources. Unverifiable material may be challenged and removed.

There are many other unofficial prefixes. Some of them appear to come from a numerical Greek root indicating the power of 1000 the prefix means. Others are based on the names of the Marx Brothers. These prefixes are as follows: This article is about the comedian siblings. ...

Prefix Purported meaning
udeka- (U) 1036
udekta- (U) 1036
una- 1033
vendeka- (V) 1033
weka- (W)[1] 1030
wekta- (W) 1030
decetta- 1030
dea- 1030
grouchi- 1030
nea- 1027
xenna- (X) 1027
xenta- (X) 1027
novetta- 1027
harpi- 1027
lotta- (L) 1027
nova- (N) 1027
taxo- (Tx)[2] 1027
otta- 1024
hepa- 1021
ento- 10−21
fito- 10−24
syto- 10−27
xenno- (x) 10−27
novemo- 10−27
empto- (e)[2][3] 10−27
harpo- [4] 10−27
lotto- (l) 10−27
novo- (n) 10−27
millikan- (mkan) 10−27
tredo- 10−30
weko- (w) 10−30
decemo- 10−30
groucho- [4] 10−30
revo- 10−33
vendeko- (v) 10−33
zeppo- [4] 10−33
gummo- [4] 10−36
chico- [4] 10−39

Obsolete prefixes

Some prefixes were used in older versions of the metric system but are not part of the modern metric system, the SI. The International System of Units (symbol: SI) (for the French phrase Syst me International dUnit s) is the most widely used system of units. ... Look up si, Si, SI in Wiktionary, the free dictionary. ...


The prefixes 'myria' (ma or my, for 10000) and 'myrio' (mo, for 1/10000) came from the Greek μύριοι (mýrioi) 'ten thousand'. Part of the original metric system adopted by France in 1795, they were not retained when the SI prefixes were agreed internationally by the 11th CGPM in 1960. The International System of Units (symbol: SI) (for the French phrase Syst me International dUnit s) is the most widely used system of units. ... 1795 was a common year starting on Thursday (see link for calendar). ... An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol) to form a decimal multiple or submultiple. ... The General Conference on Weights and Measures is the English name of the Conférence générale des poids et mesures (CGPM, sometimes written in English Conférence Générale des Poids et Mesures). ... Year 1960 (MCMLX) was a leap year starting on Friday (link will display full calendar) of the Gregorian calendar. ...


They were rarely used, though the myriameter (10 km) is occasionally encountered in 19th-century train tariffs. In Sweden (and possibly other countries), the myriameter is still very common in everyday use, simplifying the way of denoting long distances (although not recognized or used officially). In Swedish, this unit is called 'mil', not seldom causing confusion when Swedes use the English word 'mile' (incorrectly) as a direct translation. A mil (Norwegian and Swedish for mile) is a unit of length, usually used to measure geographic distance, fairly common in Norway and Sweden. ... “Miles” redirects here. ...


Of units customarily used in trade in France, the myriagramme (10 kg) was the metric replacement for the avoirdupois unit of the quarter (25 pounds) (whereas the Myriogramme is also a genus of seaweed). The avoirdupois (IPA: ; French:) system is a system of weights (or, properly, mass) based on a pound of seventeen ounces. ... Myriogramme is a genus of red algae in the class Florideophyceae. ... Ascophyllum nodosum exposed to the sun in Nova Scotia, Canada Dead Mans Fingers (Codium fragile) off Massachusetts coast For the band, see; Seaweed (band) For the rock musician, see; Seaweed (musician) Seaweeds are any of a large number of marine benthic algae. ...


Also obsolete are metric double prefixes, such as those formerly used in micromicrofarads, hectokilometres, micromillimetres, and so on.


Proposed systems

A proposal by Jim Blowers describes the naming scheme as follows:


zetta is Z + -etta, which is an alteration of septi-, meaning 7, as 21 is 7 groups of three. yotta is Y + -otta, an alteration of octo-, meaning 8. The pattern here is that we go backwards from the beginning of the alphabet, starting with z and y, and we follow it up with an alteration of the Greek or Latin for the next number. According to this pattern, the next ending should be xona-, since X comes before Y in the alphabet, and 9 is noni- in Latin. Similarly, 1030 should be weka-, since W precedes X and 10 is deka in Greek.

Factor Name Symbol Factor Name Symbol
10−1 deci- d 101 deca- da
10−2 centi- c 102 hecto- h
10−3 milli- m 103 kilo- k
10−6 micro- μ 106 mega- M
10−9 nano- n 109 giga- G
10−12 pico- p 1012 tera- T
10−15 femto- f 1015 peta- P
10−18 atto- a 1018 exa- E
10−21 zepto- z 1021 zetta- Z
10−24 yocto- y 1024 yotta- Y
10−27 xonto- x 1027 xona- X
10−30 wekto- w 1030 weka- W
10−33 vunkto- v 1033 vunda- V
10−36 unto- u 1036 uda- U
10−39 trekto- td 1039 treda- TD
10−42 sotro- s 1042 sorta- S
10−45 rimto- r 1045 rinta- R
10−48 quekto- q 1048 quexa- Q
10−51 pekro- pk 1051 pepta- PP
10−54 otro- o 1054 ocha- O
10−57 nekto- nk 1057 nena- N
10−60 mikto- mi 1060 minga- MI
10−63 lunto- l 1063 luma- L

There have also been proposals to use the units of one of these systems with prefixes of a different base than ten, e.g. binary, duodecimal or hexadecimal. Deci- is a Latin numerical prefix meaning 10. ... This article is about the SI prefix. ... Centi (symbol c) is a SI prefix in the SI system of units denoting a factor of 10-2, or 1/100. ... Hecto (symbol h) is a SI prefix in the SI system of units denoting a factor of 102 (100). ... Milli (symbol m) is a SI prefix in the SI system of units denoting a factor of 10-3, or 1/1,000. ... Kilo (symbol: k) is a prefix in the SI system denoting 103 or 1,000. ... Micro is a SI prefix in the SI system of units denoting a factor of 10−6 (one millionth). ... Mega (symbol M) is a SI prefix in the SI system of units denoting a factor of 106, i. ... This article describes the SI prefix. ... Giga (symbol: G) is a prefix in the SI system of units denoting 109, or 1 000 000 000. ... For other meanings of Pico see Pico (disambiguation) Pico (symbol p) is a prefix in the SI system of units denoting a factor of 10-12. ... Tera (symbol: T) is a prefix in the SI system of units denoting 1012, or 1 000 000 000 000. ... Femto is a prefix (see all prefixes) to a unit and means that it is 10-15 times this unit, or, one quindecillionth (European) or one quadrillionth (American). ... This article describes the SI prefix peta. ... Atto- (symbol a) is an SI prefix to a unit and means that it is 10-18 times this unit. ... Exa (symbol E) is a prefix in the SI system of units denoting 1018 or 1 000 000 000 000 000 000. ... Zepto (symbol z) is a prefix in the SI system of units denoting a factor of 10-21. ... Zetta (symbol Z) is a SI prefix in the SI system of units denoting 1021 or 1 000 000 000 000 000 000 000. ... Yocto (symbol y) is a SI prefix in the SI system of units denoting a factor of 10-24. ... Yotta (symbol Y) is a SI prefix in the SI system of units denoting 1024 or 1 000 000 000 000 000 000 000 000. ... // In computing, binary prefixes can be used to quantify large numbers where powers of two are more useful than powers of ten (such as computer memory sizes). ... The duodecimal (also known as base-12 or dozenal) system is a numeral system using twelve as its base. ... In mathematics and computer science, hexadecimal, base-16, or simply hex, is a numeral system with a radix, or base, of 16, usually written using the symbols 0–9 and A–F, or a–f. ...


References

  1. ^ Proposals for an extended system of units.
  2. ^ a b 'Ask A Scientist' Time Terminology.
  3. ^ Emptosecond pulses.
  4. ^ a b c d e http://backpan.perl.org/authors/id/P/PI/PIP/Time-Fields-1.0.3CCA4Eh.readme

External links


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