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by sltkr 37 days ago
Control-shift-u, 9, space/enter, works on most Linux systems.

To explain: control-shift-u allows entering a Unicode character by its hexadecimal code. This presumably depends on the Input Method Editor (IME) in use, which is something I've never fully understood, but this seems to work widely across different desktop environments (Xfce, KDE) and display servers (Xorg, Wayland).