I have a Chromebook on which I installed Arch Linux. However, this Chromebook comes with a very odd key: a "Power On/Off" key at the top right of the keyboard. Without ANY warning, this button turns off the computer. Naturally, I have been pressing this key when looking for backspace or when my finger slipped while pressing surrounding buttons. As a consequence, I have turned off my computer at very impractical moments. This has to stop.
How can I disable or remap this key?