I don't own one (yet) but having a read of the manual it seems to work in the following formats.
Eunit/Wunit – Elevation/Windage Unit. These are the units of measure used in the elevation and windage turrets of the scope.
Mil –Miliradian
TMOA – True Minute of Angle (typically written MOA) where 1 MOA equals 1.047" at 100yds
SMOA – Shooters MOA, a less frequently used approximation of MOA where 1 MOA is rounded to exactly 1 inch at 100 yards.
That's my take on it but I could well be wrong
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