Reach

Source Core Rulebook pg. 283 4.0
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.

Monk Unarmed Attacks

Shadow Grasp, Stinging Lash

Weapons

Asp Coil, Bec de Corbin, Bladed Scarf, Bo Staff, Boarding Pike, Breaching Pike, Broadspear, Chain Sword, Dancer’s Spear, Donchak, Dwarven Dorn-Dergar, Elven Branched Spear, Fauchard, Gill Hook, Glaive, Gnome Flickmace, Guisarme, Halberd, Horsechopper, Injection Spear, Kusarigama, Lance, Lancer, Long Hammer, Longspear, Meteor Hammer, Naginata, Nodachi, Pantograph Gauntlet, Ranseur, Scorpion Whip, Thorn Whip, Whip, Whip Claw, Wrecker