3e SRD:Weapon Finesse
From D&D Wiki
|This material is published under the OGL|
Weapon Finesse [General]
Prerequisite: Proficient with weapon, base attack bonus +1 or higher. Choose one light weapon. Alternatively, the character can choose a rapier, provided the character can use it in one hand, or a spiked chain, provided the character is at least Medium-size.
Benefit: With the selected weapon, the character may use a Dexterity modifier instead of a Strength modifier on attack rolls. Since the character needs the second hand for balance, apply the armor check penalty of any shield worn to attack rolls.
Special: The character can gain this feat multiple times. Each time the character takes the feat, it applies to a new weapon.