Inserting "Pi" symbol into projects

For PC, turn numbers lock on. Then while holding down the ALT key, press 227 on the number keypad. Then release the ALT key.

For the MAC, hold down the Options key and press P.

You can always use an image of Pi from powerpoint or elsewhere and insert that into your slide. Not the most elegant of solutions, but it'll work in a pinch.

Or, on a PC, enter ALT-227 into a text caption and you get π You should be able to get it on a Mac through the keyboard symbols dialog also.

Take a look at https://www.keynotesupport.com/websites/greek-letters-symbols.shtml for a chart of all the Greeks