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Wiktionary
f+

n. An academic grade given by certain institutions. Slightly better than an F and slightly worse than a D-.

Wikipedia
F+

F+ may refer to:

  • F+ (pitch), a musical pitch traditionally used for the Northumbrian smallpipes
  • F a bacterium having F-plasmid in bacterial conjugation
  • In Academic grading in the United States, F+ is a rarely used grade above F
F+ (pitch)

F+ is a musical pitch approximately 20 cents sharp of modern concert F (500 + 20 = 520 cents), and is primarily associated with the Northumbrian smallpipes.

Similarly, composer Ben Johnston uses a "−" as an accidental to indicate a note is lowered 21.51 cents, or a "+" to indicate a note is raised 21.51 cents (which is the width of a syntonic comma ). 498.04 + 21.51 = 519.55 (Just perfect fourth + syntonic comma = F+).