soadshuyin
They dont really have names. Theyre distinguished by how they are, really.
The main blade is...well....called the Main Blade. The next sword is the Hollow Blade which is named because it has no core to it so it can fit onto the Main Blade. The next two pieces are the Serrated Blades which are serrated on the sides. And the final two pieces are the Switch Blades, which flip up like switchblades to fit onto the sword.
The whole thing, the Main Blade + Hollow Blade + Serrated Blades + Switch Blades all equal the First Tsurugi.
The main blade is...well....called the Main Blade. The next sword is the Hollow Blade which is named because it has no core to it so it can fit onto the Main Blade. The next two pieces are the Serrated Blades which are serrated on the sides. And the final two pieces are the Switch Blades, which flip up like switchblades to fit onto the sword.
The whole thing, the Main Blade + Hollow Blade + Serrated Blades + Switch Blades all equal the First Tsurugi.
So, corresponding to the diagram:
1. is the Main blade (duh)
2. The hollow blade.
3+4. Are two identical swords, the serrated blades
5+6. Once again, identical swords, the switch blades.
That's how it goes, right? I thought there was only one of each sword, since I only saw him hook up one of each.