fl,

[STEVE]

Ran across a new abbreviation that might be of interest:

fl.

floruit

v.

Used in conjunction with a specific period or set of dates to indicate when a particular historical figure lived, worked, or was most active.

And I'd always thought it stood for 'floor' or 'fluid'!

STEVE

[dfilpus]

Informally, fl. can be an abbreviation of "flourished".

[marnen]

Yup. This is a case where the abbreviation is technically from the Latin, but could just as well stand for the English (kind of like "s." for "shilling", which really comes from Lat. "solidus").