Setup

We need to make sure that Vim encoding is set to UTF-8.

To check what encoding you are currently using, run this command

set encoding?

If it outputs something like this

encoding=utf-8

Then you are good to go.

Otherwise, set this option in your .vimrc file

set encoding=utf-8

Inserting unicode characters

After doing the setup above, you are now ready to enter unicode characters.

1. Enter Insert or Replace Mode
2. Press Control + v
3. Press u
4. Enter the unicode number of the character

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I learned about this tip while I was customizing my Syntastic linter options. My goal was to use unicode characters for the error and warning markers in the gutter.