What is the name of Ezio Auditore's hidden-blade weapon in Assassin's Creed: Brotherhood?

Ezio Auditore uses the Hidden Blade as his signature concealed weapon in Assassin's Creed: Brotherhood.

The Hidden Blade is a retractable wrist-mounted weapon used by members of the Assassin Brotherhood for close-range assassinations. Ezio carries the weapon throughout his Italian adventures and uses it both during stealth attacks and in direct combat.

Brotherhood expands the weapon system with upgrades and additional equipment, including a poison blade and a ranged crossbow. The game also lets Ezio recruit and train new Assassins, linking his personal gear to the wider growth of the Brotherhood in Rome.

The Phantom Blade belongs to Assassin's Creed Unity, where it combines a hidden blade with a compact ranged mechanism. The Rope Dart is especially associated with Assassin's Creed III, and the Apple of Eden is a Piece of Eden rather than a conventional weapon. Those distinctions make the standard name the Hidden Blade.