F(number), NF(number) Floor number in Daemonheim. The N variant stands for "Need floor".
F2P, F2Pers, Ftp, Freers Non-members (Free-to-play).
Fally Falador.
Farcaster/FC Someone who casts a "hold" spell and doesn't go face-to-face with another player (often used with Ancient Magicks).
Fc/Fcc Friends chat channel.
Ff Fish Flingers, Faithful shield.
FFA Free for all. Person who deals the most damage gets the drop.
FI/Fall/Fi Fall in, used to get people to follow a leader into a war or battle or player killing trip.
Fist, FoG Fist of Guthix.
Flat A term used to describe having 99 Attack, Constitution, Defence and Strength.
Flip(ing) A trading term that refers to buying an item and then, within a short period of time, selling it for a profit.
FM Firemaking, Farming, Forum moderator, Fish mask.
FMod Forum moderator.
Focus Focus sight.
Fogging Playing Fist of Guthix.
Fogscape When a graphics glitch causes the edge of the map (on your main screen) to be foggy instead of black, even when you have fog off.
Frag(s) Short for "fragments"; e.g. Soul fragments used in Soul Wars; fragments in Stealing Creation; Sacred metal fragments used in the Battle of Lumbridge; Chronicle fragment used in Divination
Fraw(s) Free raws, when at a fishing spot (i.e. trout and salmon).
Fremmy, Frem Fremennik.
Froob Free-to-play noob.
Frost(s) Frost Dragon or Frost Dragon Bones
Full Complete set that usually consists of a helm, shield, body piece and leg piece (such as full dragon armour); or inventory being full (e.g. picking flax).
Funning Duelling for fun (possible rules and no stake).

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