Local Authorities/ Barcelona Police
Amalgamation is the process of combining two entities in to one. Brown references the alchemical process through which mercury is combined with another metal.
Nazi Swastika/ Buddhist Symbol of Prosperity
Dan Brown has already indirectly referenced these symbols in Origin. (See Jainism in the prologue section)
The papal cross is the symbol of the office of the pope. It is a staff with three horizontal bars descending in size.
Cambridge, Massachusetts is Robert Langdon’s home and also the location of Harvard University, where he is a professor.
Uber is an American company, founded in 2009 and headquartered in San Francisco. It is a private-hire business that uses contractors to provide low-cost rides to customers. The company has been called a pioneer of the shared-economy, and was one of the first groups to introduce the idea of ride-sharing. The name Uber comes from the German word Über, meaning above.
Finn Amster