This is pretty vague, but I'll answer it to the best of my ability.
40k --- 40,000
WS --- Weapon Skill
BS --- Ballistics Skill
S --- Strength
T --- Toughness
I --- Initiative
Ld --- Leadership
Sv--- Armour Save
If you mean Warhammer Fantasy, Gamesworkshop sells it.
warhammer 40k or 40,000 is the year. It is 38,000 years in the future.
If you mean the MMORPG "Warhammer Online", the answer is yes.
If you mean Warhammer 40,000 and Warhammer Fantasy Battle witch Warhammer online is based there was in earlier versions of the games, But much of i has been changed in the current incarnation.
The initials SWL mean Safe Working Load
These are the designers initials.
If you mean which company produces Warhammer that would be Games Workshop and to a far lesser extent Forge World.
It depends on whether it is the epic (around 5mm), warmaster (around 2mm), warhammer fantasy (around 29-30mm) or warhammer 40,000 (28-29mm). It also depends if you mean the troops, or the vehicles and monsters.
It should mean armor save such as 3+
Millimolar
If you mean the international car registration then it is Switzerland
KC is the initials of his FaceBook account, apparently.