Why is the word "hectare" abbreviated as "ha" and not as "he"? [closed]
Why is the word "hectare" abbreviated as "ha" and not as "he"?
https://en.wikipedia.org/wiki/Hectare
Hectare is from the Greek hect, the multiplier, and are, the primary unit of land measurement and the base unit. It means 100 ares, so it makes sense to abbreviate to the initials of the multiplier and base. We do the same thing with kilogram ("kg"; not "ki"), millimetre ("mm"; not "mi"), nanosecond ("ns"; not "na"), and so on. – comment by niamulbengali