Iconography was the branch of art history which studied or analyzed the subject matter and meaning of the content of images.
According to Hoshi Sato, Xindi-Insectoid iconography was different from the iconography used by the other Xindi species. (ENT: "Hatchery")
In 2256, the iconography on the side of a device was identified as Klingon. (DIS: "The Vulcan Hello")