A hard reset is usually the term used for a battery pull. wiping the device by going into options-> security options and wiping the device pretty much resets it back to the factory defaults so to speak. If you are looking for removing the entire OS and reinstalling, check the FAQ's.
Thanks everyone. Yes, terminology issue here. I was searching for the wrong search phrases apparently. Sorry - I am new to BlackBerry having come from decades of Palm use, lol.