Plasma damage
From FOnline: Aftertimes
Plasma damage is done by plasma grenades and some of the Energy Weapons: Plasma Pistol, Plasma Rifle, etc.
The Plasma damage resistance is a combat statistic. Any plasma damage done to a player or critter is first reduced by a percentage (plasma Damage Resistance) and by a set amount (plasma Damage Threshold).
Every armor has a DR and DT for each damage type and it is mostly through armors that a player can increase his DR and DT statistics.
Other damage types: