w Sword Two Bladed

A two-bladed sword is a double weapon’ twin blades extend from either side of a central, short haft, allowing the wielder to attack with graceful but deadly flourishes.

A two-bladed sword is a double weapon. You can fight with it as if fighting with two weapons, but if you do, you incur all the normal attack penalties associated with fighting with two weapons, just as if you were using a one-handed weapon and a light weapon. A creature wielding a two-bladed sword in one hand can’t use it as a double weapon’ only one end of the weapon can be used in any given
round.

Weapon Feature(s): double

Two-Handed Melee Weapons (Exotic)
WeaponCostDamage (S)Damage (M)CriticalRange IncrementWeightTypeSpecial
Sword,
two-bladed
100 gp1d6/1d61d8/1d819-20/×210 lbSlashingdouble

Source: Core Rulebook