Assassin insignia

The Assassin insignia of the Assassin Order, though varying slightly over different time periods and countries, held essentially the same shape and style. Each of its variations also possibly denoted the various sects of the Order.

High Middle Ages
During the High Middle Ages, the insignia was used to mark the entrances of Assassins' Bureaus, and could be seen on the banners decorating the fortress of Masyaf.

Renaissance
During the Renaissance in Italy, it was used on the mechanisms in the many Assassin Tombs, and on the banners and walls of Monteriggioni. It was also displayed on the banners hung in the Tiber Island headquarters.

In Constantinople, Assassin Dens and ziplines had a small Assassin insignia atop them, while Bomb-crafting stations were all painted with the Turkish Assassins' personal insignia.

Appearances on Assassins
Additionally, the insignia was worn openly on the armor and clothing of certain known Assassins, such as Mario Auditore, Ezio Auditore da Firenze, Nikolai Orelov, Altaïr Ibn-La'Ahad, and Connor Kenway. Certain modern-day Assassins also wore the insignia in the form of a tattoo, such as Daniel Cross.

Trivia

 * In the Sanctuary, all of the statues have different variants of the Assassin insignia on their waists.
 * In Assassin's Creed: Brotherhood, Desmond searches for Assassin insignias painted onto the walls to guide him to the Colosseum Vault.
 * The cape worn during the Carnevale in Assassin's Creed II bears the Assassin insignia.
 * The insignia bears some resemblance to the symbol of the Freemasons (the Square and Compasses).
 * Both the original insignia and the Russian variation are vertically asymmetrical, unlike the Italian variation. However, the symmetry of the Italian logo may be because of the Renaissance ideals of the time, in which mathematical proportions and symmetry were standard.
 * The original Assassin insignia can be seen on the back of the Seusenhofer Armor, and the Armor of Brutus.