The Phoenix Badge is a premium skill that was recently added to the iOS version of SAS: Zombie Assault 3
The Phoenix Badge.
through an update. You can attach the badge to any weapon, which increases its damage, fire rate and reload speed by 30%. It is only available for purchase at Rank 50, for $5.99. When purchased, it resets your rank to level 1. You will also lose all of your money, grenades, turrets, weapons and weapon upgrades. Premium weapons and skills will not be lost after you buy the Phoenix Badge.
Example of the badge one a weapon