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 Times, The Telegraph, the USA Today, The New York Times, the LA Times, the Penny Press, the King Feature Syndicate and The Mirror.

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