Entering special charcter with keyboard shortcut

[ehud.behar at protonmail.com]

I want to insert with a keyboard shortcut a special character that I use a lot in my document. Until now it was saved in my system clipboard and I would just paste it wherever I wanted, but I want to use a keyboard shortcut for that.

For example, I want to insert this symbol: № (Unicode U+2116 or № in html).

How can I do it?

I tried to do it as seen in the attached picture but LyX gives the message Unknown or invalid LyX function.
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