In Japan, koi is a kind of a symbol of love and friendship. This is because the koi is a homofon to another word also means affection or love. The Koi is a kind of fish including carp (Cyprinus carpio) that have the ornaments are very beautiful and gentle. Koi are usually kept as a decoration with the aim of beautiful and good luck in the house and outside of the house (a koi or water park, because the koi fish believed to bring good luck, because the koi fish very closely allied with a goldfish, and therefore in the country a lot of people call it a goldfish koi.