Damage Threshold

Damage Threshold is a combat statistic in Fallout, Fallout 2, and Fallout Tactics: Brotherhood of Steel. It was removed in Fallout 3, leaving Damage Resistance as the only armor statistic. However, it's been hinted that it might come back in Fallout: New Vegas.

Any damage taken is reduced by this amount. Damage threshold can be increased by wearing armor.

Note, however, the difference from armor class, which helps dodge the attack, and damage resistance, which reduces damage by a certain percentage after the damage threshold.