So you know that song that plays when you start up the PS2 with FFX-2 in it, and the song that plays when you get an Episode Complete. I've seen in called several thing, all resembling "Eternity: Memory of Lightwaves" (also, Memory of Light and Wave, Memory of Wave and Light, ect ect.) Well I went to Luca Theatre on a New Game+ recently and the game calls the song "KUON: Memories of Waves and Light." So my question, what does KUON mean. Is it a word in another language? Is it referenced in the game somehow? Is it possibly an acronym since it's in all caps?

Thank you in advance.