On Mon, Apr 27, 2020 at 10:37:24AM +0000, ndame wrote:
> > What is the "established terminology"?
> 
> Left button, middle button, right button. I know no mainstream tool
> which calls the left button mouse-1, etc

Then your world is too small :-)

X has always called those buttons 1, 2, 3. And for good reasons,
as this thread has shown...

Cheers
-- t