The Kotetsu is a weapon in Final Fantasy XII. It is the weakest katana and is significantly weaker in the Zodiac versions, as it is made available at the beginning of the game because katana are the primary weapon of the Bushi. Its license costs 35 LP.
Nagasone Kotetsu was a Japanese swordmaker of the early Edo period. Kotetsu worked as an armorer for some time, but later switched to swordmaking. His swords were known for their great strength and their ability to cut through helmets. However, Kotetsu's swords were often faked, and they were so well faked that even Kotetsu himself is said to have not been able to tell the difference.
"Ko" (虎) means "Tiger" while "Tetsu" (鉄) means "Iron". "虎" alone can also be pronounced "Tora". Literally, Kotetsu means "Tiger Iron" or "Iron of the Tiger" in Japanese.