cheat sheet

[ cheet sheet ]
/ ˈtʃit ˌʃit /

noun Informal.

a sheet of paper or a digital document containing information used by a student for cheating on an exam or in the classroom: She had a cheat sheet for the history test with a list of the correct answers.
a document containing notes or other aids used as a reference in studying or remembering certain information: I used a cheat sheet with statistics and bar graphs to prepare for my radio interview.

Origin of cheat sheet

First recorded in 1935–40 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019