I hadn't thought of that before, but is Brewhouse even the best option? That too makes it seem factual.
We're essentially trying to show a calculated, theoretical number and an actual, measured number, correct? Just like Estimated OG and Measured OG?
(A .300 baseball hitter's average is based on earlier attempts, and no guarantee he will get 3 hits out of next 10 bats.)
So would Calculated Efficiency and Measured Efficiency be more clear and consistent with some other data points such SG, SRM, IBU and ABV?
All those are calculated targets before the brew, and then the Measured actuals are taken later.