This seems like something I've encountered a lot in practice, but can't think of the answer now or where to find a good example. Suppose I have a violin section, and the score calls for one player to play a melody while the remaining players play a counterpoint. Obviously I can mark the first melody "solo" - what is the marking for the other part? Preferably both are on the same staff, though I think the problem would remain even on two staves. Additionally, the counterpoint comes in later than the solo melody, so it even a little bit harder to see the context. See below - the soloist plays pizz, and the rest play arco starting the last beat of the second bar. It's probably clear with no marking at all, but just in case, I would prefer a marking that would remove any doubt.