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Myria- (symbol my) is a now obsolete
decimal The decimal numeral system (also called the base-ten positional numeral system and denary or decanary) is the standard system for denoting integer and non-integer numbers. It is the extension to non-integer numbers of the Hindu–Arabic numeral ...
metric prefix A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic. Each prefix has a unique symbol that is prepended to any unit symbol. The pre ...
denoting a factor of 104 (ten thousand). It originates from the
Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...
μύριοι (''mýrioi'') (
myriad A myriad (from Ancient Greek grc, μυριάς, translit=myrias, label=none) is technically the number 10,000 (ten thousand); in that sense, the term is used in English almost exclusively for literal translations from Greek, Latin or Sinospher ...
). The prefix was part of the original metric system adopted by France in 1795, but was not adopted when the
SI prefix The International System of Units, known by the international abbreviation SI in all languages and sometimes pleonastically as the SI system, is the modern form of the metric system and the world's most widely used system of measurement. E ...
es were internationally adopted by the 11th
CGPM The General Conference on Weights and Measures (GCWM; french: Conférence générale des poids et mesures, CGPM) is the supreme authority of the International Bureau of Weights and Measures (BIPM), the intergovernmental organization established i ...
conference in 1960. In 1685
John Wallis John Wallis (; la, Wallisius; ) was an English clergyman and mathematician who is given partial credit for the development of infinitesimal calculus. Between 1643 and 1689 he served as chief cryptographer for Parliament and, later, the royal ...
proposed the usage of myrio. Also, in 19th century English it was sometimes spelled myrio, in line with a
purist Purism is an arts movement that took place between 1918 and 1925. Purism may also refer to: *Purism (Spanish architecture) (1530–1560), a phase of Renaissance architecture in Spain *Purism (company), company manufacturing Librem personal comput ...
ic opinion by Thomas Young. The ''
myriametre The following are examples of orders of magnitude for different lengths. __TOC__ Overview Detailed list To help compare different orders of magnitude, the following list describes various lengths between 1.6 \times 10^ metres and 10 ...
'' (10 km) is occasionally encountered in 19th-century train tariffs, or in some classifications of wavelengths as the adjective '' myriametric''. The French ''
mesures usuelles Mesures usuelles (, ''customary measurements'') were a French system of measurement introduced by Napoleon I in 1812 to act as compromise between the metric system and traditional measurements. The system was restricted to use in the retail indust ...
'' (1812-1839) did not include any units of length greater than the ''
toise A toise (; symbol: T) is a unit of measure for length, area and volume originating in pre-revolutionary France. In North America, it was used in colonial French establishments in early New France, French Louisiana (''Louisiane''), Acadia (''Acadi ...
'', but the ''myriametre'' remained in use throughout this period. (Website based on ''Alte Meß- und Währungssysteme aus dem deutschen Sprachgebiet'', .) In Sweden and Norway, the ''myriametre'' is still common in everyday use. In these countries this unit is called '' mil''. Of units customarily used in trade in France, the ''
myriagramme The myriagram (french: myriagramme) is a former French and metric unit of mass equal to 10,000 grams (''myriad'' being the Greek word for ten thousand). Although never as widely used as the kilogram The kilogram (also kilogramme) is the unit ...
'' (10 kg) was the metric replacement for an
avoirdupois The avoirdupois system (; abbreviated avdp.) is a measurement system of weights that uses pounds and ounces as units. It was first commonly used in the 13th century AD and was updated in 1959. In 1959, by international agreement, the definiti ...
unit, the '' quartier'' (25 pounds).
Isaac Asimov yi, יצחק אזימאװ , birth_date = , birth_place = Petrovichi, Russian SFSR , spouse = , relatives = , children = 2 , death_date = , death_place = Manhattan, New York City, U.S. , nationality = Russian (1920–1922)Soviet (192 ...
's novel ''
Foundation and Empire ''Foundation and Empire'' is a science fiction novel by American writer Isaac Asimov originally published by Gnome Press in 1952. It is the second book in the ''Foundation'' Series, and the fourth in the in-universe chronology. It takes place in ...
'' still mentioned the ''
myriaton The tonne ( or ; symbol: t) is a unit of mass equal to 1000  kilograms. It is a non-SI unit accepted for use with SI. It is also referred to as a metric ton to distinguish it from the non-metric units of the short ton ( United State ...
'' in 1952. The myria's symbol of ''my'' ultimately led to its demise. In 1905 the
Comité International des Poids et Mesures The General Conference on Weights and Measures (GCWM; french: Conférence générale des poids et mesures, CGPM) is the supreme authority of the International Bureau of Weights and Measures (BIPM), the intergovernmental organization established i ...
(CIPM) assigned it the symbol ''M'', wishing to use only single-letter symbols. This meant that myriameter, for example, was abbreviated Mm. But in the first part of the twentieth century, electrical engineers began to use capital M for the prefix
mega- Mega is a metric prefix, unit prefix in metric systems of units denoting a factor of one million (106 or 1000000 (number), ). It has the unit symbol M. It was confirmed for use in the International System of Units (SI) in 1960. ''Mega'' comes fro ...
, as in
megawatt The watt (symbol: W) is the unit of Power (physics), power or radiant flux in the International System of Units, International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3. It is used to quantification (science), ...
and
megohm Ohm (symbol Ω) is a unit of electrical resistance named after Georg Ohm. Ohm or OHM may also refer to: People * Georg Ohm (1789–1854), German physicist and namesake of the term ''ohm'' * Germán Ohm (born 1936), Mexican boxer * Jörg Ohm (b ...
. This usage became so widely and firmly adopted that in 1935 the CIPM adopted the prefix “mega-” with “M” as its symbol, dropping the myria- entirely. In 1975, the United States, having previously authorized use of the
myriameter The following are examples of orders of magnitude for different lengths. __TOC__ Overview Detailed list To help compare different orders of magnitude, the following list describes various lengths between 1.6 \times 10^ metres and 10^ ...
and
myriagram The myriagram (french: myriagramme) is a former France, French and International System of Units, metric unit of mass equal to 10,000 grams (''myriad'' being the Greek word for ten thousand). Although never as widely used as the kilogram, the myri ...
in 1866, declared the terms no longer acceptable.


See also

*
Myriagon In geometry, a myriagon or 10000-gon is a polygon with 10,000 sides. Several philosophers have used the regular myriagon to illustrate issues regarding thought. Meditation VI by Descartes (English translation). Regular myriagon A regular myriag ...
*
Myriapoda Myriapods () are the members of subphylum Myriapoda, containing arthropods such as millipedes and centipedes. The group contains about 13,000 species, all of them terrestrial. The fossil record of myriapods reaches back into the late Silurian, a ...
*
dimi- A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple (mathematics), multiple or submultiple of the unit. All metric prefixes used today are decimal, decadic. Each prefix has a unique symbol that is prepen ...
(aka decimilli-, a former French metric prefix denoting the inverse (10−4) of the myria- prefix up to 1961 (a translation of the French original ''Esprit et bon usage du systeme metrique'', 1965) *
hebdo- Hebdo- (symbol H) is an obsolete decimal metric prefix equal to 107. It is derived from the Greek ''hebdοmos'' ( el, ἕβδομος) meaning ''seventh''. The definition of one ''hebdomometre'' or ''hebdometre'' as was originally proposed by R ...
*
Obsolete metric prefix A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple (mathematics), multiple or submultiple of the unit. All metric prefixes used today are decimal, decadic. Each prefix has a unique symbol that is prepen ...


References

{{Reflist, refs= {{cite book , title=A Proposal about Printing a Treatise of Algebra, Historical and Practical , author-first=John , author-last=Wallis , author-link=John Wallis , publisher=John Davis , location=
University of Oxford , mottoeng = The Lord is my light , established = , endowment = £6.1 billion (including colleges) (2019) , budget = £2.145 billion (2019–20) , chancellor ...
, UK , date=1685 , page=16 , url=https://books.google.com/books?id=TXpmAAAAcAAJ , access-date=2017-01-21 , quote=And yet if this Number be not thought large enough, let all these (saith he) be called the ''First Period''; and this ''Unit'', a Unit of the first Numbers of the second Period; and (after so many places more) a Unit of the first Numbers (or Classis) of the third Period; and so onward to a Myriad of Myriads of such Periods: The last Unit of which, that is, one Myriad of Myriads, of the Myrio-myresimal Classes, of such Myrio-myresimal Period, answers (in our Notation) to 1 followed by 8, 0000, 0000, 0000, 0000, Ciphers: That is, 1 with Eight Myriads of Myriads of Myriads of Myriads of Ciphers.
{{cite book , date=1889 , author-first=Le Roy Clark , author-last=Cooley , title=The New Text-book of Chemistry: For Use in High Schools and Academies , publisher=Ivison, Blakeman, Taylor& Company , url=https://archive.org/details/newtextbookchem01coolgoog , quote=10 kiloliters = 1 myrioliter {{cite book , date=1895 , title=The West American Scientist , quote=The myriogram equals 22.046 lbs. avoirdupois. Greek words and phrases Metric prefixes Decimal prefixes