You searched for: “quod erat faciendum”
Quod erat faciendum, Q.E.F., QEF.
Which was to be done.
This is often appended to a mathematical solution, with the meaning, "We have done the work we were required to do."
This entry is located in the following unit: Latin Proverbs, Mottoes, Phrases, and Words: Group Q (page 4)