The Polo Symbols: Arsenal was a virtual representation of one of Ezio Auditore da Firenze's genetic memories, relived by Desmond Miles in 2012 through the Animus.
Description[]
Climbing to the top of tallest mast of the ship in the western part of the Harbor of Theodosius, Ezio scanned a Polo symbol on the dock just north of his position.
Outcome[]
Ezio located and unearthed the book titled The Book of Kings.