Its actually a very clever name (as is Piper). Rat -> Mouse Bag -> Because it works with all mice ie. its a catch-all. d -> daemon lib -> library There's a

Its actually a very clever name (as is Piper). Rat -> Mouse Bag -> Because it works with all mice ie. its a catch-all. d -> daemon lib -> library There's also a mouse brand (Madcatz) who have are known for their gaming mouse, Rat (stylished R.A.T.). To gamers, they're known for their quality mice. That should tell you enough, and if it doesn't you're free to embrace curiosity to figure it out on your own.