Module damage
The separate damage value a shell applies to modules and crew members, which is what decides whether a hit tracks, breaks or wounds.
Also known as damage to modules, crit damage.
Modules and crew have their own hit points, and a shell carries its own damage figure against them, usually different from the damage it deals to the vehicle itself. A hit that penetrates near the engine deals its vehicle damage and separately chips the engine's health.
This is why a shell that fails to penetrate can still track a target: the impact applies module damage to the tracks even when the hull takes nothing.
Related terms
Critical hitDamage to a module or a crew member, which degrades what a vehicle can do without necessarily costing it hit points.TracksThe running gear, which immobilises the vehicle when broken and absorbs shells like spaced armor when intact.High explosiveA shell that explodes on contact, dealing reduced damage through armor it cannot penetrate and splashing everything nearby.