Not to be confused with typography, typology is the study or systematic ordering or classification of types ? as in kinds, not the types involving letter forms ? that have characteristics or traits in common. This is necessarily an interest of art historians, museum curators, registrars, preparators, and art librarians, along with many who work with classification systems in the science community. Semiotics includes the study of typology, along with studies of iconography and iconology.Also see class, genre, interdisciplinary, order, science and art, and thematic.