Letter F

1. The sixth letter of the alphabet. Denoting the next after E in a set of items, categories, etc.
2. The sixth highest or lowest class of academic marks (also used to represent “Fail”).
3. Chess denoting the sixth file from the left, as viewed from White's side of the board.
4. Music the fourth note of the diatonic scale of C major. It is also a key based on a scale with F as its keynote.
5. The chemical element fluorine.
6. Physics force: F = ma.