Computer Help and Support

There's a way to bold, italic, or underline text in a post. We can use the buttons above the post textbox, or we can code [ ], putting a b, an I, or a u, inside the brackets. (If I actually type the text, it won't show because it will just alter the font.
What I'm asking is if there's a way to raise or lower a character. For instance, instead of 2^5, it would actually raise the 5 up to show 2 to the 5th power.
Or, lowering the "2" in CO2. That way the formula would look chemically correct.
It's easy in any Office program, but doesn't apply when posting to a site like this.