What is wrong with "J"-word?

Hi world.

I tried to request the mod J-e-w-e-l-r-y-c-r-a-f-t 2 on request forum, but it said that word is banned (you see, i have to even pronounce its name symbol by symbol, otherwise "banned"). The search string gave me nothing. What is the reason?

The same thing is about j-e-w-e-l-r-y.

Thanks, sir!