Please be more charitable. I legitimately looked. All I found were biased pieces calling them beg buttons. I'm asking for an unbiased source calling them that. It seems the real term is a pedestrian call button.
I’m sure you’ll find a way to disqualify that also, but well. By the way this was like the fourth result on a ddg search, there are many more if you care to actually look and read.
Source for your beg button claim? I've only seen that term used with a political spin. (And yes, I tried looking it up)