"Canary" (informant) is a (somewhat dated) slang term for a criminal who decides to inform on another criminal, from the expression to 'sing like a canary'.
In computing, canaries or canary words are dummy data fields used in the implementation of stack-smashing protection. The name is an allusion to the use of canaries as warning devices in coal-mines.
In the British sci-fi sitcom "Red Dwarf", the Canaries are a militia of prisoners who volunteer to investigate derelict space craft and other anomalies in exchange for being able to get out of the brig for a bit. The name of the group derives from the old mining practice of using canaries to check tunnels for gas.
Canary (Golden Wisp Bird) is a character in manga Rozen Maiden.
Red Canary is an online magazine based in Toronto, Canada. Its focus is on emerging Canadian technology companies and related issues. See startup.
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