Fine, this isn’t strictly a OneNote tip, but it can be kind of useful in OneNote as a form of tagging (if you don’t just want to use the normal tags).
If you use Windows 10, and you’re current on all your updates, you might find this to be a fun way to add color (and searchable conceptual tags) to your OneNote pages – or just to your conversations, emails, and Photoshop documents.
It’s a very simple shortcut: place your cursor in whatever text field you’d like to insert the emoji, then hold the Start button and press period (.) at the same time.
You should see this:
Now you can either scroll through and find the one you were looking for, or you can search. Yes, search. Just start typing, and the emoji will be filtered down to anything that matches what you typed. Use the arrow keys to move to the one you want and press enter.