Reach

Source Core Rulebook pg. 283
Natural attacks with this trait can be used to attack creatures up to the listed distance away instead of only adjacent creatures.

Weapons with this trait are long and can be used to attack creatures up to 10 feet away instead of only adjacent creatures. For creatures that already have reach with the limb or limbs that wield the weapon, the weapon increases their reach by 5 feet.

Weapons

Bo Staff, Glaive, Gnome Flickmace, Guisarme, Halberd, Horsechopper, Lance, Longspear, Ranseur, Whip