You may wondering how I made this inline figure (icon). There is actually a   in the title (a very thin space, you can copy it between this two arrows → ←). It is so thin that you can almost ignore it. ****
I tried to use ​ (means a space with zero width) in title or just text block but failed. However, we are able to type it in database formula editor, and copy & paste it into text properties. I tried to turn that database into simple table, move the text column to the first and turn back into database, the character just disappeared. Seems Notion does not allow to use it in titles. If you know ways to use it in title, please let me know.