Kanji means Chinese letter or character and are ideographs meaning that the whole character conveys a meaning rather than just a sound. Koi fish symbolize strength and good fortune in religions and spiritual teachings, including Buddhism. The Koi Fish is symbolic in the Buddhist Religion, representing courage. Humans 'swim' through the 'ocean of suffering' without fear, just like a fish swims through water. . This kanji symbol is for Energy. Koi fish have also become popular in tattoo designs.