Can someone please explain...
I can't for the life of me work out why you would prefix a callsign with anything. I know from my strip (or when I was back in Oz my label on my screen) what aircraft type he was. Hopefully the pilot knows, or he's in real strife. I'll let the other aircraft in the sky know what he is if I need to pass traffic, so the reason for the prefix is.....
If its due to callsign confusion, i'd agree with the previous post, get full readbacks and you'll be right.
I have to admit I've wanted to prefix callsigns with certain words but not exactly aircraft type if you know what I mean.