I use two parts.
Part one is scribbling the notes in between the text on a script. This depends on how much room is there though.
Part two is using a lined legal pad with
Q number, description, and any additional notes (i.e. followspot).
But as other people have said, I'm not aware of any 'standard' that is used. From the legal pad I make up a printed document when I have time before the show starts.