Mystical marking (4)

I believe the answer is:

rune

'mystical marking' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for rune that I've seen before include "Mystical symbol" , "Ancient symbol" , "Old Scandinavian letter" , "Old alphabet letter" , "Letter of an ancient Germanic alphabet" .)

I've seen this clue in The Wall Street Journal.

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