In
Dungeons & Dragons' third edition
Player's Handbook, Ambidexterity is described as a
feat (special ability) that your
player character (or "PC") can acquire. From the
Player's Handbook (p.80):
"You are equally adept at using either hand.
A great feat if you have plenty to spare, in
this noder's
opinion. It helps reduce penalties for being a
badass and fighting with two weapons, which, obviously, is for
hardcore ass-kickers. Similarly, it helps the user use
double weapons.