Question: What is written on the rear window in a foreign language?
Question: If the military code breaking was a delusion, why did Alicia converse with and have the door opened by an MP officer where she even said, "wow you must be really important." Why was the MP there then?
Answer: There was always a basis of reality for his delusion. As I recall it, early on, Nash was actually recruited by the Pentagon to study encrypted telecommunications of foreign enemies. Nash's association with the government appears to have been limited, but it became a springboard for his extreme fantasy of working for the U.S. Department of Defense and with the unreal Agent Parcher.
Answer: You do not specify to which scene you are referring. The only window I recall with writing on it would be the window in Nash's room. John had covered this window in mathematical equations, theorems and geometric patterns. While most of the symbols used are Greek in origin, the language is simply that of mathematics.
Michael Albert