Fist
The fist is the standard weapon available on all of the Grand Theft Auto games.
The fist icon is really the "unarmed" state for the Protagonist, and it allows the player to fistfight. Punchs and kicks are its moves, and is actually quite powerful when fighting one-on-one with someone. In Grand Theft Auto: San Andreas, the player can go to the 3 different Gyms to teach CJ 3 different fighting styles to use.
Unlike any other weapon, the fist is always available for use. Its main disadvantage is that it lacks power and range. Free-aiming with fists also has no effect on passers by or police, unlike a firearm which would cause panic and wanted-level stars.