Alternatively Compose + tm works if you have Compose key enabled. Easier to use than memorizing Unicode code point numbers, for the supported characters at least.

Unless the culprit is that one process permanently stuck in uninterruptible disk sleep, in which case the timer would just perpetually go up, and pressing 7x Ctrl-Alt-Del as you mentioned will simply shut down systemd and the kernel itself will start complaining (faulty hardware can cause this)

Slightly behind the front ones, they do seem to be slightly obstructed from view though.

Welcoume to British spelling.