Isotype can refer to:

• In crystallography, an "Isotype" is a synonym for isomorph
• In biology, per the International Code of Botanical Nomenclature, the "Isotype" is a duplicate of the holotype.
• In graphic design and sociology, "Isotype" refers to the "International System of Typographic Picture Education". It was developed by the Austrian educator and philosopher Otto Neurath, along with the illustrator Gerd Arntz. Visually, it owes a lot to a clean-lines, 1920s realist/deco aesthetic. In 'a picture speaks a thousand words' kind of a way, Isotype was developed as a way of conveying quantitative information with social consequences - the availability of bread and sugar, the manpower involved in constructing automobiles, in different countries. Isotype may have some common ground in intentions with Buckminster Fuller's Geoscope.
• In immunology, the "immunoglobulin isotype" refers to the heavy chain type (IgA, IgD, IgG, IgE, or IgM).

Isotype