So far I've seen "RPi", "RP", "Rasp Pi", and "The Pi".
I know it might not truly matter, but should we stick to a consistent format to avoid confusion? I've been edited a few times on StackOverflow for using abbreviations, saying that they make questions and answers confusing in the first place. So should we pick an abbreviation to try to make the most use of? Or scrap abbreviations overall? Or does it not really matter?