Mine differ for whatever kind of show I'm calling.
If I'm using the musical score, for opera or musicals, I use colored dots for all my Warnings/Standbys/GOs. For warnings and standbys, I put the colored dot first, at the time I should start saying it. My GOs, though, I write above the music that I should start saying it with, leaving the colored dot for the placement of the GO so that I know I have enough time to articulate everything.
When I'm working on a musical or straight play where I'm calling from words, I use a little asterisk for when the talking should happen. Particularly if it's a fast paced show.