H.C.F stands for highest common factor. That means the highest number which is a factor of all the numbers, that is the highest number that divides all the numbers without remainder.
As such, it is just a number with no units.
A hundred cubic feet, a unit of measure of water volume, usually encountered in water metering and billing, equivalent to 748 gallons.
HCF stands for Hutchinson Correctional Facility, a prison in Kansas. The East Unit is the minimum security wing. The Genesis Jaycees is a chapter of the Junior Chamber of Commerce associated with the facility.
As far as I am aware, CO is not a unit of measure.
A unit can be a measure of length. It is one-dimensional. A squared unit can be a measure of area. It is two-dimensional. A cubic unit can be a measure of volume. It is three-dimensional.
This depends on what unit you are using to measure in. However, area will always be measure in (unit)^2.
division
The international (SI) unit of mass is the kilogram.
The measure unit of a kilometer stick is kilometer.
The unit of measure for work output is the joule (J).
the least unit to measure the length is fermo meter .
Hertz, hz= 1/second is the unit measure of frequency.
Class room can be measure in Meters easily :)