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On Android, every app has a unique package name used by the system for identification. "Katana" was chosen as the internal codename for the Facebook app by its early developers.

: The name was intended to represent an app with "multiple layers," similar to how a katana sword is forged. On Android, every app has a unique package

: It was reportedly named after a sushi restaurant called "Katana". On Android, every app has a unique package