Ooo, I see!
Just read up on it on the wiki as well and help files.
The /noop command simply discards all the values after evaluating its arguments like mIRC would in an ordinary command. This is useful for identifiers that return a value but you do not wish to do anything with these values.
Performs no operation, parameters are evaluated as with a normal command.
Is there anything apart from $tip that calls out to an alias by default?