XNOR is to
XOR as
NOR is to
OR.
Returns true or 1 if the two inputs are the same. That is, the inputs are either both true or both false.
A B Result
----------
0 0 1
0 1 0
1 0 0
1 1 1
XNOR is not used that often, however, it does sound cooler than any other logic operator. Zzz-Nor.