How to access special characters in linux?

I am unable to use special characters in my Linux terminal. Please help as it is creating problems for me.

Hi @500067869

To enter a character by its code point, press Ctrl + Shift + U , then type the four- character code and press Space or Enter . If you often use characters that you can’t easily access with other methods, you might find it useful to memorize the code point for those characters so you can enter them quickly.