Caduceus: The symbol of Dr. Sinskey’s lapis lazuli necklace, the modern symbol for medicine, as she explains. She, however, is incorrect (intentionally).
C-130: A type of military plane, generally used to transport large weapons or large groups of men. The WHO mobile coordination center is the bay of a C-130.
Hanscom Field: A public airport in Bedford, Massachusetts. Used heavily by citizens of Boston and people in the surrounding area. The location at which the Dr. Sinskey met and picked up Dr. Langdon.
Cambridge, Massachusetts: An immediate suburb of Boston, Massachusetts. Cambridge is the location of Harvard University, the school at which Langdon works, and also where he lives.
Biblioteca Apostolica: The Vatican Library, one of the most important libraries in the world in regards to its content. In the context of the novel, Langdon informs Sinskey that Boticelli’s Map of Hell is located in the Library.
Rod of Asclepius: The actual symbol of medicine, as Langdon points out. The confusion is a common occurrence, as a caduceus has two snakes on the staff and wings at the top, while her amulet had one snake and no wings.