property of a phenomenon, body, or substance, where the property has no magnitude
EXAMPLE 1 Sex of a human being.
EXAMPLE 2 Colour of a paint sample.
EXAMPLE 3 Colour of a spot test in chemistry.
EXAMPLE 4 ISO two-letter country code.
EXAMPLE 5 Sequence of amino acids in a polypeptide.
NOTE 1 A nominal property has a value, which can be expressed in words, by alphanumerical codes, or by other means.
NOTE 2 'Nominal property value' is not to be confused with nominal quantity value.
ANNOTATION (informative) [3 December 2013] Nominal properties are distinguished from quantities, which are properties that have a magnitude, that is, they can be compared in terms of greater or lesser.
ANNOTATION (for Examples 2 and 3) (informative) [3 December 2013] While colour of a paint sample is sometimes considered to be a nominal property, it is also recognized that a pure colour can be characterized by the wavelength of electromagnetic radiation, which is a quantity that can be measured.