hm
hm — abbreviation
1. a written abbreviation for 'hectometre' or 'hectometer': a metric unit of length
a written abbreviation for 'hectometre' or 'hectometer': a metric unit of length equal to 100 metres, written as 'hm' after a number.
The survey marker showed the elevation as 45 hm above sea level.
abbreviation used in surveying / mapping
According to the map, the river is roughly 3 hm wide at this bend.
The team measured the length of the running track at 4 hm.
written after a number without a space before unit
The distance between the two villages on the old map was given as 12 hm.
number + hm pattern in cartographic context
- hm + number
- number + hm
Usage Note
This abbreviation appears mainly in technical written contexts such as surveying, cartography, and scientific reports. In everyday spoken English, speakers usually say '100 metres' or '0.1 kilometres' instead of 'one hectometre'.