In a former job, I developed “software” (I clicked together some LabVIEW…) for custom designed scientific experiments, which many other researchers (mostly PhD students) would use. Wrote detailed SOPs for their usage, because everything was wonky and in constant evolution, and in some circumstances, data generated could be wrong. So I put a toggle switch with some cryptic acronym on the panel which was told to be flipped in the SOP when users reached the part where following instructions was really critical. The toggle switch did nothing but to log time and date and what user was logged in. When discussing weird data later on, first thing I did was to check whether that log existed, and if not heavily scrutinized the data with respect to errors that could be induced by not following the SOP.
Nucular, it’s pronounced nucular.