it is unit for one and units for 2 or more
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It is the unit's digit of the product of the unit's digits. For example, the units digit of 123456 * 4689 is simply the units digit of 6*9 = 54, which is 4.
a unit rate describes how many units of the first type of quantity
Standard deviation has the same unit as the data set unit.
You can convert between the units.