Battle Master (3.5e Equipment)
From D&D Wiki
Battle Master: A battle master weapon grants a number of advantages to make you a more fearsome opponent on the battlefield. First, you are treated as being one size category larger for purposes of combat maneuvers such as disarming, sundering, and tripping, and for purposes of bonuses to these rolls, you are treated as wielding a two-handed weapon (if you aren't) or having four legs (if you don't already). Second, you are treated as if you had the feats Improved Disarm, Improved Feint, Improved Sunder, and Improved Trip, but only in regards to the battle master weapon. If you already possess these feats, you gain an enhancement bonus equal to the weapon's enhancement on any checks made when performing those actions in combat.