Title: OA means Original Art and was created from the term OC which means Original Character. Details: If a piece is original to an artist on this site, then it will be put in this category. So, if the artwork is animated and hasn't been published in an anime, manga, etc, then it will be placed here! For example, if I come across a picture of Light from Death Note, it would be placed in another category because the original artist didn't create it for the purpose of this site.