cheat-sheet

Noun

cheat sheet (plural cheat sheets)

1. A sheet of paper (or a digital analogue thereof) containing notes used to assist (with or without permission) on a test; especially, such a sheet used secretly and improperly.
   • If you have trouble remembering all the trigonometric identities, the book has a cheat sheet in back that lists them.

   Synonyms:

   crib sheet

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