The Division 2 Wiki
The Division 2 hands out loot with short names, and the entries in the A-Z list below say what each name means and what it changes in a build. Chainkiller is a named Walker, Harris & Co. chest piece whose Perfect Headhunter talent adds bonus damage to the next hit after a headshot kill. SHD Calibration covers recalibration, the Base of Operations feature that moves attributes and talents from one piece of gear to another.
Defense and support have entries of their own. Hazard Protection lowers the chance that a hit applies a status effect such as shock. The Reviver Hive and Restorer Hive entries explain two skills: one brings downed allies back inside its radius, the other repairs armor on friendly agents in range. The Legacy Season Cache entry covers the cache that pays out loot from earlier seasons.
Onlyfarms also offers Division 2 services in its shop, and longer walkthroughs sit in the Division 2 guides. Aiming vocabulary that is not specific to this game, such as hit markers, the reticle and aim down sights, has separate entries in the general gaming wiki.