I posted an answer yesterday which earned +10 points, taking me to 41.
The little "Trophy" icon (3rd to left in the top right) is telling me
"You've earned the "comment everywhere" privilege!
Learn more about it in the help center.
However the rest of the system says (correctly) I get that at 50.
The Trophy icon goes across multiple stackexchanges but the notice is clearly for (and maybe from) Unix & Linux (it's got the "UL").