noun
crib notes; cheat sheet; study guide
Slang term for a condensed reference or answer key, often used by students. Can refer to a physical booklet or digital notes. The 'key' gloss applies to explanatory diagrams or maps.
試験前に友達から虎巻をもらった。
I got a cheat sheet from a friend before the exam.
この虎巻を見れば、回路図の記号がすぐわかる。
If you look at this key, you can quickly understand the symbols on the circuit diagram.