cheat sheet
US /ˈtʃiːt ˌʃiːt/
UK /ˈtʃiːt ˌʃiːt/
1.
a piece of paper containing notes or information used illicitly as a memory aid during an exam or test
:
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He was caught using a cheat sheet during the math exam.
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Make sure you don't leave any cheat sheets in your pockets before the test.
2.
a concise set of notes or instructions providing a quick reference to information, often for legitimate use
:
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I always keep a cheat sheet of keyboard shortcuts next to my computer.
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The programmer created a cheat sheet for common coding commands.