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The key combination [Shift]+2 should do for standard keyboards to type the "at" (@) sign.
Hold down the Shift key and press the Equals sign to the left of "Backspace"("Delete" in Macs).
The '~ #' key is between (diagonally speaking) the enter key and the right shift key on an English keyboard.
Hold shift and then press the 2 key on the number row above the letters (not the keypad).
Hold down the shift key and press the 3 key It will make a # sign.
on keyboard it is two keys to right of L then also press Shift to get @ sign or copy that sign above or hold Alt key and type 64 then release Alt to get @ like that.
Type the power required - e.g. 2, then continue typing, even if it is only a space. Highlight the power (without picking up that space), click on FORMAT, then FONT. Tick the boxes for SUPERSCRIPT, OK and all is done. Why did you need the extra space? Because when you continue typing, you want it to be in the original size, otherwise you would have to go back and set the following text back to normal. (The methodology of worrying about the formatting at the end, rather than as you go can be a timesaver.)
You use the symbol of "at" on your keyboard. It is on the number 2 key. You will need to hold down the "shift" button with your right pinky finger, while hitting the number 2 key with your left ring finger.
Generally about the "=", next to the Backspace key. Hit <Shift> =
it's an "At" key or an "At sign" also known as "Commercial At"
@ (Shift + 2) is referred to simply as the "at sign."
The addition sign is on your computer keyboard. The key is right next to the backspace button. You press shift-(the key) and you will get the addition sign.