Non-SI unit prefixes

Non-SI Unit Prefixes

Non-SI unit prefixes

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A number of unit prefixes, similar to the standardized SI prefixes, have been used or proposed by various sources, but which are not part of the International System of Units (SI).

Former metric prefixes

Some prefixes were used in older versions of the metric system but are not part of the modern metric system, the SI.

The prefix myria, denoting a factor of , originated from the Greek μύριοι (mýrioi), that is, myriad, for ten thousand, and the prefixes demi- and double-, denoting a factors of 1/2 and 2 respectively, were parts of the original metric system adopted in France in 1795, but they were not retained when the SI prefixes were agreed internationally by the 11th CGPM conference in 1960. They were dropped because they were not decimal, nor symmetrical. They were rarely used, though the myriameter (10 km) is occasionally encountered in 19th-century train tariffs, or in some classifications of wavelengths as the adjective myriametric. In Sweden (and possibly elsewhere), the myriameter is still very common in everyday use (although not recognized or used officially). In Swedish this unit is called 'mil', sometimes causing confusion when Swedes use the English word 'mile' (incorrectly) as a direct translation. Of units customarily used in trade in France, the myriagramme (10 kg) was the metric replacement for an avoirdupois unit, the quarter (25 pounds). (see also myriogramme,...
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