We can't look it up .... ?I never thought to ask this question and is a great question. I don't know. I would think it would have a name along the line of "Throttle Cam" or something like that. Without knowing more on what your bike is, I can't even look it up. I did tried a few different models, but it did not list that part name on the parts list. So I can't say I could easily get a name, even if I did know what you have.
➕ .. ?I have a feeling that part isn't normally changed, I've never heard of one wearing out, so it may not be available separably from the carburetor or throttle body. Your best bet might be a motorcycle salvage place and buy the whole assy., if it's a common bike you might find one very cheaply.
There are many salvage places, a local would be best but if not try pinwall cycles, and also ebay searches for the whole assy for whatever bike your working on.