cheat sheet

/CH IY1 T SH IY0 T/
noun
  1. 1

    A sheet of paper containing notes used to assist (with or without permission) on a test.

    โ€œIf you have trouble remembering all the trigonometric identities, the book has a cheat sheet in back that lists them.โ€

  2. 2

    Any summary or quick reference used as a shortcut or reminder, such as an aid for public speaking.

Source: https://en.wiktionary.org/wiki/cheat%20sheet