How to insert unicode character or special character or symbols

Problem:

You need to type a special character but you can’t find it on the keyboard.

Solution:

You can type the code character (number) to get the character.

Step by step:

1. Open a Terminal, and press Ctrl+Alt+T.
2. In Ubuntu, hold down together: Ctrl + Shift + u. After that, a underlined u letter should appear. Release keys. Enter the Unicode for the symbol you need. For example: Enter 7E(Unicode code for ~), press space or Enter.

If you need to view the Unicode codes table:

• Legacy Entity sets
• Unicode Character Ranges for Scientific Documents

Source:

https://www.w3.org/TR/2014/REC-xml-entity-names-20140410/
https://www.linux-magazine.com/Online/Blogs/Productivity-Sauce/How-to-Enter-Unicode-Characters