A bit silly, but I can't type this character ಠ, on ubuntu.
Some page say it should be this way
Ctrl+Shift type u0CA0
But it doesnt do anything. Even I find a shortcut for sublime that I didn't know that exist before try this.
Ubuntu – How to type special character on ubuntu
special characters
Related Solutions
A macro would be overkill in this scenario. There's a much easier option: Autocorrect.
In LibreOffice Writer go to Tools --> Autocorrect:
Define a string and its replacement:
As you can see I used this method for a set of arrows and it works fine. It might not be the minimum-keystroke option you were searching for, but it sure is far less complicated than a macro.
I guess your AltrGr-key is configured as a compose-key, this enables you to use multiple keystrokes to compose your characer.
eg. the compose-key, ' and e will output é
Best Answer
It's Ctrl+Shift+u all together, and an underline will appear under the u, then you type the hexadecimal value for the Unicode character, and then press Space or Enter to confirm it.