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Hectometre.
Hectometer
A Hectometer. http://en.wikipedia.org/wiki/Hectometre
It is the prefix
The SI unit of area is the square metre (m2), so as a hectometre is 100 metres, a square hectometre is 100m2, it doesn't need another name. Before the rationalisation of the metric system to SI units in 1960 the unit of area was the are, the are was equal to 100m2.