Sooner or later, now matter how stable your system may be, you will experience the situation where your system completely freezes and you can't do anything, not even call a terminal or log out of the session. In those cases, the Linux kernel has a feature that might interest you.

While holding Alt + SysRq, type R E I S U B (without spaces) and the computer will reboot. For a detailed explanation about what the entered characters do, have a look on the Wikipedia page here:

Reboot Linux system on freeze
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