The term "ribbon diagram" refers to a graphical representation of the three-dimensional structure of a protein molecule. Some synonyms for this term include "cartoon diagram", "schematic representation", and "fold diagram". The use of ribbon diagrams has become commonplace in structural biology, as they provide an easy-to-understand representation of complex molecular structures. Another term that may be used in this context is "secondary structure diagram", which refers specifically to the depiction of the alpha helices and beta sheets that make up the protein backbone. Overall, the use of these diagrams offers a valuable tool for researchers to better understand the structure and function of proteins.