Versatile

Source Core Rulebook pg. 283
A versatile weapon can be used to deal a different type of damage than that listed in the Damage entry. This trait indicates the alternate damage type. For instance, a piercing weapon that is versatile S can be used to deal piercing or slashing damage. You choose the damage type each time you make an attack.

Weapons

Clan Dagger, Dagger, Gnome Hooked Hammer, Greatsword, Halberd, Horsechopper, Katana, Longsword, Main-gauche, Morningstar, Sai, Shortsword, Starknife