0 how to put the square (2 raised) symbol in Excel 2007

Three possible ways:
1. Press Alt+0178. That is, press and hold the Alt key, and type the numbers 0178 from the numeric keypad (not the top row of number keys) on your keyboard.
2. Click on Insert | Symbol, click on the superscript 2 symbol, and click on OK.
3. Type the 2 along with any other desired text in a cell, press Enter, click on the cell, press F2, select the 2, click on the Home tab, click on the little arrow at the bottom right corner of the Font group, check the Superscript box, and click on OK.