At GBS we have what could be considered dance numbers across the lip of our stage. The number 0 marks center and then the numbers count out every two feet to the procenium arch. In college and at other theaters I use just measure light place ment off of center. But I find that the number system across the stage really helps when hanging lights, regardless if we are talking house pipes, catwalk, or battons. This year I have asked to add matching numbers on the upsatge side of the stage, and or adding the numbers to the battons with a paint pen. These numbers will be masked when the cyc is flown in, but will help when hanging upstage electrics and drop boxes. Let me know if you all have any other ideas or suggestions.