# Type

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**Type** can mean a number of things of relevance to psychologists:

- Biological type, which fixes a scientific name to a taxon

**Type** in mathematics and statistics can also refer to:

- Type (metaphysics), in metaphysics and ontology

- Equivalence class, in set theory and musical set theory

- Type (model theory), in mathematics

- Theory of Types, a means by
**Bertrand Russell**to further discuss the mapping of mathematics to logic in philosophical logic

- A proposition or a set in the Intuitionistic Type Theory

## See also Edit

- Typology, the study of types