Only the Barbarian can throw two weapons at once using this skill.
To a Barbarian, fighting with two weapons is considered a fairly simple feat. Not so simple is mastering the art of throwing two weapons simultaneously and accurately. Many young Barbarians are eager to learn this skill, for they will tell you it is concrete proof that they have risen to greatness as a warrior. In truth, they use this skill in tavern games almost as often as they do in battle, winning wagers from unsuspecting drunkards.
↑Diablo II Manual, page 63. Blizzard Entertainment, 2000.