I used the abbreviation "fJ" for "femtojoule" in my circuits project report. I was wondering if my usage of such bizarre obscure units would impress the grader, and for that matter anyone else reading the report. But upon searching Google it became clear that in some circles, this is considered a familiar, unremarkable unit. Oh well.
Such is the life of students in my university around exam period. (But not necessarily the rest of the year)