From Halopedia, the Halo wiki
Were you looking for the Activation Index, called "Sacred Icon" by the Covenant?
Icon is a prose from the short story collection Halo: Evolutions - Essential Tales of the Halo Universe. It describes the lives of John-117, the SPARTAN-IIs and Spartan-IIIs, and the legacy they left. It was written by Jonathan Goff, while Gabriel "Robogabo" Garza created the artwork.