"Sign" (semeion) is a key term in the Fourth Gospel.  There, in Greek as in English, the implication of calling a miracle a "sign" rather than a "wonder" is that its importance lies not in its spectacular nature ("What a wonderful thing!") but in what it signifies about something else (such as the person of the wonder-worker, or the advent of the Kingdom of God, or the breadth of divine compassion, or the like).  Would Eliot have been reading the Gospel in Greek?

Jerry Walsh