Khopesh

Khopesh: You can use the hooked blade of a khopesh to make trip attacks. If you are tripped during your own trip attempt, you can drop the khopesh to avoid being tripped.

Exotic One-Handed Melee Weapon
Cost: 16 gp
Dmg (S) 1d4 Dmg (M) 1d6 Dmg (L) 1d8
Critical: 18-20/x2
Range Increment:
Weight: 4 lb
Damage Type: Slashing

Source: Sandstorm