Question 690261
"name all sets" ... is problematic, so I need to answer in a somewhat general way 

-12 is a negative integer so it belongs to any set for which the negative integers is a subset. Examples include the reals, the integers, the negative integers, the rationals as well as such finite sets as {-12}, {-12, 1}, and so on...

sqrt(11) belongs to the irrational numbers