A nickname for ghosts is "a piao", you know the "a" is what's put on most nicknames, just like how "-chan" is used in japanese, but the "piao" is "floating", so it's sort of like when you say "oh, and there's an a piao", it's like you're saying "oh, and there's a floatie" or something like that, but it's never really translated well directly, it's hard to find an equivalent