Linux X11 Mouse Button Numbering

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In Linux X11, each mouse button is assigned a number.

How to find the X11 mouse button number?

type xev in terminal, then click the button to see its number.

linux x11 xev output 2015-11-08
xev output

To exit xev, just close its window.

Here's the numbering:

〔➤ Linux: How to Swap Mouse Buttons

Mouse Numbering on Windows & Mac

The numbering also depends on OS and mouse driver.

For example, on Mac OS X 10.4.x, using a Microsoft 5-buttons mouse, the numbering changes depending on whether you have Microsoft's mouse driver (IntelliPoint) installed.

Numbering Scheme on Mac OS X with Microsoft 5-buttons Mouse without IntelliPoint Software

If you don't have IntelliPoint installed, then Mac OS X doesn't register the mouse wheel tilt left/right, and your Backward (4th) button is the same as right-button, and Forward (5th) button is 4th button.

Here's the numbering reported by emacs's describe-key.