Most programming languages support operators similar to the following 6, which are spelled here as in C.==  !=  <   <=  >   >=I'm aware of several terms used to include all of these operators. In approximately my perceived best-first order, these are...EDIT  list fixed after Jerry Coffins answer...Relational operatorsComparison operatorsConditional operatorsRelative operatorsWhat are the reasons to prefer/avoid each particular term.
What should I call the less-than and similar operators?
terminology;operators
I'd call then relational operators (because that's what they are).Relative operators doesn't even seem to make sense (perhaps you really intended relational operators?)Comparison operators is all right, but less descriptive.Conditional operators is ambiguous (at best). In C or C++, it's often used for the ternary ?: operator.