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:
“There are two kinds of timidity—timidity of mind, and timidity of the nerves; physical timidity, and moral timidity. Each is independent of the other. The body may be frightened and quake while the mind remains calm and bold, and vice versë. This is the key to many eccentricities of conduct. When both kinds meet in the same man he will be good for nothing all his life.”
—Honoré De Balzac (1799–1850)
“Woe unto you, lawyers! for ye have taken away the key of knowledge: ye entered not in yourselves, and them that were entering in ye hindered.”
—Bible: New Testament Jesus, in Luke 11:52.
“You have many choices. You can choose forgiveness over revenge, joy over despair. You can choose action over apathy.... You hold the key to how well you make the emotional adjustment to your divorce and consequently how well your children will adapt.”
—Stephanie Marston (20th century)