Sometimes you just need a small reminder instead of a detailed chart or you have to quickly jot down the roadmap of a tune and your orchestration ideas.
Below is an example of my shorthand mini chart system. The major sections of the form [verse (v), chorus (c), pre-chorus (pc) etc…] are shown with the number of measures in each part. The instrument played (or tacet) is indicated where necessary and any specific rhythms, stops, or hits are notated.
You can probably decode this one: