How to get any character in Gnome

If you have a system running Gnome (say, Ubuntu), then you can enter any Unicode character by its code by pressing Ctrl-Shift-U <hexadecimal code> <Enter> .

The already mentioned technique with Compose allows you to enter a very wide range of symbolovolov, but still not all.

It is clear that remembering codes is more difficult than “Compose - - -”, but for most symbols there is no other way than to run charmap and copy from there. After a couple of copies of the required characters, their codes are usually memorized, and can be entered from the keyboard. It saves me a lot of effort.
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(If this information is known to you for a long time, do everyone a favor and keep silent.)