From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Fighting Fan

ITEM 0

UNCOMMON AGILE BACKSTABBER DEADLY-D6 FINESSE MONK

Price 11 sp

Usage held in 1 hand

Bulk L

Category martial

Group knife

Damage 1d4 slashing

This fan is useful for elegant dances as well as for slicing unsuspecting foes with the blades along its outer edge. If used in performances, it might be disguised as a frilly accessory, or it might be an obvious, though elegant, weapon.

Pathfinder Treasure Vault (Remastered)ORC