MO to Lieven (11/23?/2008): nIyma' is the Klingon word for phantom or apparition--something that seems to appear, but isn't really there. It's not the same as ghost, which is the spirit of a dead person (and may or may not look like that person, or may not be visible at all), and it's not the same as spirit (or qa'), which is sort of a life force within a person (that escapes when a person dies and may exist somewhere somehow). He said using qa' for ghost was OK, but I got the impression there may be another word as well (though he didn't offer one).