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pre. In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 100. Symbol: h


Hecto is a decimal unit prefix in the metric system denoting a factor of one hundred. It was adopted as a multiplier in 1795, and comes from the Greek , meaning "hundred". Based on a proposal by Thomas Young, the prefix was often alternatively spelled hecato- in early 19th century sources. Its unit symbol as an SI prefix in the International System of Units (SI) is the lower case letter h.

It is rarely used, except in certain specific applications: