The grad is a unit of plane angle, equivalent to
1/400 of a full circle, dividing a right angle in 100.
One grad equals 9/10 of a degree or p/200 of a radian.
That explains "what" enough for me.
I've seen them on my calculator and I surmise that a grad
is a hundredth of a right angle.
That seems to be correct surmising.
Since that is approximately a degree it would appear to be a useless unit.
I'll leave the "why" to others, as I don't recall using it myself.
That the unit may be seen on many calculators suggests that others
find frequent use for it.
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