Creating symbol such as feet square and cube?

Creating symbol such as feet square and cube?


Not sure if I am asking a silly question... but I am not sure how to create the small number like 2 and 3 for feet square and feet volume? Can I even do that in Zoho Sheet? I tried googling and looking at the forum, but couldn't find any information about it. I don't even use Excel or any spreadsheet program before, so I am kind of clueless.

Thank you,
Amy