
There exist several unit prefixes used like the SI prefixes, but that are not part of the SI system. Some of these were never part of any actual system of measurement. A few were proposals that were rejected. None is in common use, and many of the powers of ten they represent are already taken by SI prefixes. 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). 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. These prefixes are as follows: {| border="1" |- ! Prefix ! Purported meaning |- | una | 1033 |- | vendeka (V) | 1033 |- | weka (W) | 1030 |- | dea | 1030 |- | nea | 1027 |- | xenna (X) | 1027 |- | otta | 1024 |- | hepa | 1021 |- | ento | 10-21 |- | fito | 10-24 |- | syto | 10-27 |- | xenno (x) | 10-27 |- | tredo | 10-30 |- | weko (w) | 10-30 |- | revo | 10-33 |- | vendeko (v) | 10-33 |} ==Obsolete prefixes== There are some prefixes that were used in some versions of the metric system but that are not part of SI. The prefixes 'myria' and 'myrio' came from the Greek μύριοι (mýrioi), meaning both ''ten thousand'' and "an indefinite large number". There is no Latin numerical prefixes equivalent. Adopted by the France in 1795, they were not retained when the SI prefixes were agreed internationally by the 11th Conférence générale des poids et mesures in 1960. They are still sometimes used a prefix for constructing words: *Myriad = 10,000 of anything (often used figuratively to mean "a great many" in English language) *Myriagon = a 10,000 sided polygon. *Myriapoda = a group of creatures including the centipedes and millipedes. Also obsolete are metric system double prefixes, such as those formerly used in micromicrofarads, hectokilometres, micromillimetres, and so on. ==External links== * [http://news.bbc.co.uk/1/hi/magazine/3673262.stm BBC article suggesting that a brontobyte is 1027 bytes] * [http://www.sybase.com/content/1031253/EnterpriseUnwired.pdf Sybase article suggesting that a brontobyte is 1024 or 1027 bytes] (Note article's table a few pages down. Note also it mistakenly places 1 terabyte = 1,000 megabytes. It should be 1 terabyte = 1,000 gigabytes. Also yottabyte is shown incorrectly as zottabyte. With those corrections, it also is clearly 1027.) * [http://www.ucl.ac.uk/~uczcw11/modules/p028l03.ppt Article suggesting that a brontobyte is 1021 bytes] * [http://openc.k12.or.us/sitedocs/styleguide/abbreviations.html Article suggesting that a brontobyte was 1015 bytes before the creation of the prefix peta-] (Article is of dubious authority... suggests that Greek letters ν, π, and φ are SI prefixes for nano-, pico-, and femto-, instead of n, p, and f. SI prefixes
''This article was originally named Obsolete SI prefixes.'' ==Name or scope of article is wrong== This article is badly named, and the merging here of Obsolete metric prefixes was wrong. Prefixes like myria, and like hectokilo- and micromicro-, are not unofficial "SI prefixes". They are not and never have been SI prefixes. They were legitimate prefixes in earlier versions of the metric system. There could legitimately be an article about expansions which somebody of some credibility has suggested for future expansions of SI. After all, unlike other systems, the metric system is the one which is still fully supported and updated. But that is an entirely different class of prefixes from those which were formerly used, but which nobody claims to be acceptable for use with SI, that nobody is advocating for use with SI. Either the article should be renamed with a more descriptive, inclusive name, or these prefixes should be put back into two different articles (each of which properly named—the old obsolete SI prefixes was also a totally erroneous name. User:Gene Nygaard 02:12, May 29, 2005 (UTC) :Well, originally there were a bunch of stubs about all the different prefixes. Following a suggestion on Category talk:Bogus SI prefixes, I merged them, and also mentioned myria and myrio (erroneously calling them SI). The double prefixes were added later by others. The merging of myria and myrio was also done by others. :Your main concern is that these prefixes are not in SI. I can see your point, though what I meant when I named the article was indeed that the prefixes weren't in SI. If we are to revise the organization of this section, I think we should make a distinction between units that were never official and those from other systems. First we would mention the prefixes never part of a real system, and after that put obsolete prefixes. Current proposals for expanding SI should go elsewhere (probably the main SI prefix article). How does Non-SI prefixes sound? If you have a better title we can use that. User:Eric119 03:12, 29 May 2005 (UTC) ::That's about the best Idea I could come up with, too. Doesn't seem very elegant, but probably the simplest and clearest way to do it. Maybe clarify a little with Non-SI unit prefix or non-SI measurement prefixes (singular or plural? Generally article titles are singular), because there are lots of prefixes which have nothing to do with units. Without it, lots of people might wonder what "non-SI" means, don't you think? Something that would make the meaning clearer in, for example, a category listing, where there is no surrounding text from which the context can be made clearer, or a "See also" listing which could but usually don't include such explanations. User:Gene Nygaard 03:32, May 29, 2005 (UTC) :::P.S. The title of the SI prefix article has the opposite problem, of being too narrow in scope. Many of those prefixes long predate SI, and were and still are used in other systems as well. User:Gene Nygaard 03:35, May 29, 2005 (UTC) :::I agree that Non-SI unit prefix is the best title. The SI prefix title is best left as is. I added a sentence to try to make the situation clearer. User:Eric119 23:49, 29 May 2005 (UTC)
See other meanings of words starting from letter:
Words begining with Non-SI_unit_prefix:
Non-SI_unit_prefix
Non-SI_unit_prefix
Non-SI_unit_prefixes
Non-SI unit prefix
There exist several unit prefixes used like the SI prefixes, but that are not part of the SI system. Some of these were never part of any actual system of measurement. A few were proposals that were rejected. None is in common use, and many of the powers of ten they represent are already taken by SI prefixes. 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). 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. These prefixes are as follows: {| border="1" |- ! Prefix ! Purported meaning |- | una | 1033 |- | vendeka (V) | 1033 |- | weka (W) | 1030 |- | dea | 1030 |- | nea | 1027 |- | xenna (X) | 1027 |- | otta | 1024 |- | hepa | 1021 |- | ento | 10-21 |- | fito | 10-24 |- | syto | 10-27 |- | xenno (x) | 10-27 |- | tredo | 10-30 |- | weko (w) | 10-30 |- | revo | 10-33 |- | vendeko (v) | 10-33 |} ==Obsolete prefixes== There are some prefixes that were used in some versions of the metric system but that are not part of SI. The prefixes 'myria' and 'myrio' came from the Greek μύριοι (mýrioi), meaning both ''ten thousand'' and "an indefinite large number". There is no Latin numerical prefixes equivalent. Adopted by the France in 1795, they were not retained when the SI prefixes were agreed internationally by the 11th Conférence générale des poids et mesures in 1960. They are still sometimes used a prefix for constructing words: *Myriad = 10,000 of anything (often used figuratively to mean "a great many" in English language) *Myriagon = a 10,000 sided polygon. *Myriapoda = a group of creatures including the centipedes and millipedes. Also obsolete are metric system double prefixes, such as those formerly used in micromicrofarads, hectokilometres, micromillimetres, and so on. ==External links== * [http://news.bbc.co.uk/1/hi/magazine/3673262.stm BBC article suggesting that a brontobyte is 1027 bytes] * [http://www.sybase.com/content/1031253/EnterpriseUnwired.pdf Sybase article suggesting that a brontobyte is 1024 or 1027 bytes] (Note article's table a few pages down. Note also it mistakenly places 1 terabyte = 1,000 megabytes. It should be 1 terabyte = 1,000 gigabytes. Also yottabyte is shown incorrectly as zottabyte. With those corrections, it also is clearly 1027.) * [http://www.ucl.ac.uk/~uczcw11/modules/p028l03.ppt Article suggesting that a brontobyte is 1021 bytes] * [http://openc.k12.or.us/sitedocs/styleguide/abbreviations.html Article suggesting that a brontobyte was 1015 bytes before the creation of the prefix peta-] (Article is of dubious authority... suggests that Greek letters ν, π, and φ are SI prefixes for nano-, pico-, and femto-, instead of n, p, and f. SI prefixes
Non-SI unit prefix
''This article was originally named Obsolete SI prefixes.'' ==Name or scope of article is wrong== This article is badly named, and the merging here of Obsolete metric prefixes was wrong. Prefixes like myria, and like hectokilo- and micromicro-, are not unofficial "SI prefixes". They are not and never have been SI prefixes. They were legitimate prefixes in earlier versions of the metric system. There could legitimately be an article about expansions which somebody of some credibility has suggested for future expansions of SI. After all, unlike other systems, the metric system is the one which is still fully supported and updated. But that is an entirely different class of prefixes from those which were formerly used, but which nobody claims to be acceptable for use with SI, that nobody is advocating for use with SI. Either the article should be renamed with a more descriptive, inclusive name, or these prefixes should be put back into two different articles (each of which properly named—the old obsolete SI prefixes was also a totally erroneous name. User:Gene Nygaard 02:12, May 29, 2005 (UTC) :Well, originally there were a bunch of stubs about all the different prefixes. Following a suggestion on Category talk:Bogus SI prefixes, I merged them, and also mentioned myria and myrio (erroneously calling them SI). The double prefixes were added later by others. The merging of myria and myrio was also done by others. :Your main concern is that these prefixes are not in SI. I can see your point, though what I meant when I named the article was indeed that the prefixes weren't in SI. If we are to revise the organization of this section, I think we should make a distinction between units that were never official and those from other systems. First we would mention the prefixes never part of a real system, and after that put obsolete prefixes. Current proposals for expanding SI should go elsewhere (probably the main SI prefix article). How does Non-SI prefixes sound? If you have a better title we can use that. User:Eric119 03:12, 29 May 2005 (UTC) ::That's about the best Idea I could come up with, too. Doesn't seem very elegant, but probably the simplest and clearest way to do it. Maybe clarify a little with Non-SI unit prefix or non-SI measurement prefixes (singular or plural? Generally article titles are singular), because there are lots of prefixes which have nothing to do with units. Without it, lots of people might wonder what "non-SI" means, don't you think? Something that would make the meaning clearer in, for example, a category listing, where there is no surrounding text from which the context can be made clearer, or a "See also" listing which could but usually don't include such explanations. User:Gene Nygaard 03:32, May 29, 2005 (UTC) :::P.S. The title of the SI prefix article has the opposite problem, of being too narrow in scope. Many of those prefixes long predate SI, and were and still are used in other systems as well. User:Gene Nygaard 03:35, May 29, 2005 (UTC) :::I agree that Non-SI unit prefix is the best title. The SI prefix title is best left as is. I added a sentence to try to make the situation clearer. User:Eric119 23:49, 29 May 2005 (UTC)
See other meanings of words starting from letter:
N
NA | NB | NC | ND | NE | NF | NG | NH | NI | NJ | NK | NL | NM | NO | NP | NR | NS | NT | NU | NW | NX | NY | NZ |Words begining with Non-SI_unit_prefix:
Non-SI_unit_prefix
Non-SI_unit_prefix
Non-SI_unit_prefixes
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