Indian Sign Meaning

Example : 1913, P. G. Wodehouse, The Little Nugget, ch. 12:  "You certainly are my jinx, sonny. You have hung the Indian sign on me all right."1921, Arthur B. Reeve, The Film Mystery, ch. 6:  "We have been jinxed with a vengeance. Some one has held the Indian sign on us for sure."1947, Dark Passage (motion picture), Warner Brothers:  Vincent Parry (Humphrey Bogart): Nah, I've got the Indian sign on me. It seems I can't win.1996, Mario Puzo, The Last Don, ISBN 9780345412218, p. 83 (Google preview):  "You're the only woman who ever had the Indian sign on me. I married late and I know I'll never marry again."