Isotype can refer to: Isotype (biology), a duplicate of the holotype of a species Isotype (crystallography), a synonym for isomorph Isotype (immunology), an antibody class according to its Fc region Isotype (picture language), a method of showing social, technological, biological and historical connections in pictorial form Isotype (song), 2017 song by Orchestral Manoeuvres in the Dark See also Isotope (disambiguation) Isoform