Ancient letter (4)

I believe the answer is:

rune

'ancient letter' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for rune that I've seen before include "Mystic symbol" , "Ancient symbol" , "Mysterious character" , "Old alphabet letter" , "Ancient character" .)

I've seen this clue in The New York Times, the Penny Press, The Mirror, The Times, the King Feature Syndicate, The Telegraph, the USA Today and the LA Times.

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