What is "operator<<" called?

Question

I know the names of most of the operators but not sure what operator<< and operator>> are called.

i.e.

operator=() // the assignment operator operator==() // the equality of comparison operator operator++() // the increment operator operator--() // decrement operator etc. operator<() // the less-than operator 

and so forth...

Answer 1

<< is both the insertion operator and the left-shift operator.
>> is the extraction operator and the right-shift operator.

In the context of iostreams, they are considered to be stream insertion/extraction. In the context of bit-shifting, they are left-shift and right-shift.