The Wiki's database includes an area for a single-letter (R, S, N or O) representing the level of canonicity of that element; these letters have since informally been applied to the levels of canon themselves: R-canon/C-Canon, S-canon, N-canon, and O-canon. As part of his work with the Wiki, Darth__Revan was responsible for the creation of this classification, and he spent the early stages developing and refining them into what they are today.