Inserting ASCII coded characters

How can I insert ASCII characters by using their corresponding code?

In Windoze it used to be a case of simply pressing Alt and typing the ASCII code, for example Alt+179 for a ³.

They are accessable using 'gcharmap', but I have been unable to find a method using keystrokes in RedHat 7.2

I guess that there is a really simple way of doing this, but have been unable to find it.

Cheers,
Paul

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