Chigiriki (3.5e Equipment)
From D&D Wiki
A chigiriki is a ninja weapon consisting of a staff (generally as long as the user's arm) with a chain and weight attached to the end. It is like a cross between a flail and a kusarigama.
As a limited double weapon, the chain end has reach of 10ft while the staff end has reach 5ft (and thus can be used against adjacent foes.) Otherwise, it cannot be used as if fighting with two weapons.
You can make trip attacks with the chain. If you are tripped during your own trip attempt, you can drop the weapon to avoid being tripped.
Upon a successful trip attempt, if you would normally be allowed to make a 5ft step, you may do so and immediately strike the tripped opponent with the staff end of the weapon.