I've never called projections, but I have operated them. My SM had a really strange calling style, I really don't know how to explain it, you would have to hear it to understand. It was just.. not uniform, very few standbys, sometimes it would be "lights 15 go" and other times it would just be "lights go" and I don't know how the light board op didn't wring her neck to be honest. But it wasn't a very projection-heavy show, so she would just say "projection" and the name of the cue. I can see why this wouldn't work for faster-paced pieces. I will definitely keep "TAB" in mind if I ever have to call projections!