Ame-no-Murakumo-no-Tsurugi is the original name of the Sword of Kusanagi.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

Zero is used to represent absolute zero.

Their home is always filled with amiability, to the point where everyone envies them.