In biology, a type is that which fixes a name to a taxon. Depending on the nomenclature code which is applied to the organism in question, a type may be a specimen, culture, illustration, description or taxon. For example, the Natural History Museum in London has a specimen numbered 1886.6.24.20 of the Spotted Harrier (Circus assimilis), which is the holotype for that species; the name Circus assimilis refers, by definition, to the species of that particular specimen.