What system of signaling uses flags held in different arm positions?

Which German-born writer living in Switzerland won the 1946 Nobel Prize in Literature "for his inspired writings"? Which title did both a 1946 Ingrid Bergman film and a 2009 biopic of a rapper share? Which 1946 Robert Penn Warren novel follows the rise of Southern populist governor Willie Stark? In which 1946 film noir does Rita Hayworth tease up a storm in Buenos Aires? Abdullah I, king from 1946 to 1951, dropped "Trans" from which country's name during his reign? The 1946 Linggadjati Agreement gave grudging Dutch recognition to the authority of which island nation's republic? After pilot Kenneth Arnold's 1947 sighting, which two-word term for an alien craft entered the language? Which 1947 film starred Cary Grant and Shirley Temple?