Cheat sheet; a short digest or summary of the salient information on a particular topic (such as on a single sheet of paper), for quick, easy assimilation.
Origin
1930s; earliest use found in ‘Nathanael West’ (1903–1940), author (real name Nathan Weinstein).
Definition of crib sheet in US English:
crib sheet
noun
Cheat sheet; a short digest or summary of the salient information on a particular topic (such as on a single sheet of paper), for quick, easy assimilation.
Origin
1930s; earliest use found in ‘Nathanael West’ (1903–1940), author (real name Nathan Weinstein).