An Etymological Dictionary of the German Language/Wahrzeichen
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Wahrzeichen, n., ‘mark, token, omen, signal,’ from MidHG. warzeichen, n., ‘token, mark,’ for which the equiv. MidHG. and OHG. wortzeichen (OSax. wordtêkan), n., is ordinarily used. The word has been corrupted; its primit. form and meaning are obscure. Comp. also the cognate, OIc. jartein, ‘token of recognition.’