In a universal set U, the difference between sets A and B is the set of elements of A that do not belong to B.

### Symbol

The symbol for the difference of sets is “\” which is read as “less” or “difference.”

Therefore, A \ B is read as “set A less set B” or “A difference B.”

### Example

In this universal set U, we have: E \ F = {*a*, *b*, *f*, *g*}.

As well, U \ F = {*a*, *b*, *f*, *g*, *m*, *n*}