Synchronization
Synchronization (or, for short, Synch) is Assassin's Creed's series' equivalent of a health meter. Since the events of Altaïr Ibn-La'Ahad and Ezio Auditore da Firenze experienced by Desmond in the Animus have already taken place in the past, Synchronization is a measure of how synchronized, or close to, Desmond's actions in the Animus are with the actual events in the past. If all Synchronization is lost, the simulation restarts from an earlier point.
Synchronization itself can be taken as how accurate Desmond's actions are compared to the original memories. The loss of Synchronization would therefore presumably be a sign that Desmond's (or more accurately, the player's) actions are not accurate to the past. Losing Synch by killing civilians and falling from heights would mean that Altaïr or Ezio would not have performed those actions. Furthermore, additional memories, such as rescuing civilians and collecting Flags for Altaïr, and opening Chests and collecting Feathers for Ezio, would mean that Altaïr and Ezio actually did those things. That they are optional is an indication that they aren't essential to the recreation of the events in the Animus.
The Synch meter
Is really GAY
Synchronization in Assassin's Creed
If The synch meter is gay
Synchronization in Assassin's Creed II
Synch Meter Capacity Altair is gay
Base Synchronization Altaïr's Gayness is alot
Additional Synchronization Go to hell
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