Key may refer to:
- Key (lock), device used to open a lock or door
- Skeleton key or master key, a key altered to bypass wards placed inside a lock
- Key (chart), a guide to colours and symbols used in a data chart, graph, plot or diagram
- Key (cryptography), a piece of information that controls the operation of a cryptography algorithm
- Key (engineering), a type of coupling used to transmit rotation between a shaft and an attached item
- Key (map), a guide to a map's symbology
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Famous quotes containing the word key:
“Experience has shown that the trade of the East is the key to national wealth and influence.”
—Chester A. Arthur (1829–1886)
“Japanese mothers credit “effort” as the key determinant of a child’s achievement in school, while American mothers name “ability” as the more important factor.”
—Perry Garfinkel (20th century)
“Woe to you lawyers! For you have taken away the key of knowledge; you did not enter yourselves, and you hindered those who were entering.”
—Bible: New Testament, Luke 11:52.