Throughout the game there ar 20 symbols which Subject 16 had hacked and put on the Abstergo Memory Core stolen by Lucy. They remain in the same location throughout the game. It takes a lot of time to find all these symbols once you can see them with Eagle Vision. You must complete a series of mini-games for each symbol. Subject 16 says that after you find all twenty symbols and decipher them, you will see and understand the truth. Note: The symbols are not all on the ground level and are at random locations. Two are in Tuscan (one of which is on the third floor of a viewpoint). Another is on the top left of the Assassin Home. There is also one in a stone place where Rodrigo betrays his man that you kill. It is under a wall on the side.