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Hecto-

hecto- or '''hecta-''' (symbol '''h''') is a SI prefix in the SI system of Units of measurement|units denoting a factor of 1 E2|10² (100). Adopted in 1795, it comes from the Greek language|Greek ''hekaton'', meaning ''hundred''. It is rarely used, except for certain specific applications:
- hectopascal, in meteorology, for atmospheric pressure, the modern equivalent of the traditional millibar.
- hectolitre, in agriculture, for liquids (notably wine and milk) and bulk commodities (''e.g.'' grain).
- hectogram, in agronomy, for quantities of animal feed (hectogram/animal) and for measures of agricultural productivity (hectogram/hectare); also used in Italy, abbreviated as ''etto'', for retail sale of cold cuts and meat.
- hectometre, in radio astronomy, occasionally used to indicate a Radio frequency|radio band (radio)|band by wavelength

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