Throughout the game there are a series of 20 symbols which Subject 16 had hacked and 
put on the Abstergo Memory Core stolen by Lucy. They always will stay at 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 will then be put through 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 places.