Eyes in the Back of Your Head

(Sword and Fist: A Guidebook to Monks and Fighters, page 6, DnD 3.0)

[General]

Your superior battle sense helps minimize the threat of flanking attacks.

Prerequisite

Base attack bonus +3, Wis 19+

Benefit

Attackers do not gain the usual +2 attack bonus when flanking you. This feat grants no effect whenever you are attacked without benefit of your Dexterity modifier to AC, such as when you are flat-footed.

Normal

When you are flanked, the flanking opponents receive a +2 attack roll bonus against you