Symbols and codes................Smart water..............the symbol for the Dept. of the Treasury is a key..........what do u need to unlock a lock?..................a key.......

1. The Lost Symbol

   Novel by Dan Brown
2. 3.6/5·Goodreads
3. The Lost Symbol is a 2009 novel written by American writer Dan Brown. It is a thriller set in Washington, D.C., after the events of The Da Vinci Code, and relies on Freemasonry for both its recurring theme and … MoreWikipedia
5. Published: September 15, 2009
6. Author: Dan Brown
7. Preceded by: The Da Vinci Code