So-called "key of life" (4)

I believe the answer is:

ankh

(Other definitions for ankh that I've seen before include "Hank (anag) - cross symbolising eternal life" , "Egyptian hieroglyph representing life" , "Ancient Egyptian symbol of life - khan (anag)" , "Ansate cross" , "Cross with a loop at the top, symbol of life in ancient Egypt" .)

I've seen this clue in The New York Times.

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