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)
“They have thrown away her electric toothbrush, someone else slips
The key into the lock of her safety-deposit box
At the Crocker-Anglo Bank; her seat at the cricket matches
Is warmed by buttocks less delectable than hers.”
—Randall Jarrell (1914–1965)