I do not believe this has been brought up yet but technically the name for Phantom’s sword should not be Katana as that is inaccurate. As Katanas are uniquely curved and the Phantom sword is straight edged. A more proper name for the sword would be Chokutō. Chokutō are straight edged and of similar length. Obviously Chokutō is a less appealing and familiar name for most people, I still believe the name for Phantom’s sword should be changed to something else if not Chokutō then something more befitting.
To maybe help people better visualize what a Chokutō looks like it is the same sword that Sasuke uses in the anime Naruto Shippuden.


