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 was restored in Fallout: New Vegas.

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

Damage which is reduced to minimum is indicated with a shield icon next to the health bar (either yours, or the enemy's, depending on who's getting damaged). If the damage would be reduced to minimum, but you're using AP rounds which negates some of the enemy's DT, then a broken shield icon is shown.

Damage negated in this way will never be reduced below 20% of the weapon's original damage value.

Bugs
In spite of DT being the determining factor for armor in New Vegas merchants when repairing armor will list DR instead. All armors when viewed from the repair screen have a DR of 0 NOTE: Fixed with patch 1.1.1