Fiction 4 Americans -- 2 Crimes against 2 Cryptographers 2 Fiction -- 2 Meteors -- 2 Scientists -- 2 more ... Secret societies 2 Art museum curators -- 1 Computer security -- 1 Crytographers -- 1 Freemasonry 1 Grail 1 Intelligence officers -- 1 Langdon, Robert (Fictitious character) 1 Physicists -- 1 Religious educators 1 Signs and symbols 1 less ...