This style is unlike any typical swordsman skill because it transcends physical limitations by creating an illusionary form with additional arms and heads, thus allowing Zoro to wield nine swords ...

If we count his unnamed swords, Zoro’s sword count goes up to a whopping (at least, to me) 9 swords. Wado Ichimonji is the first sword we see Zoro use, and he’ll continue to use it until the end.