The concept ‘nominal property’ is defined as the opposite of ‘quantity’, i.e. the former concept lacks the essential characteristic of ‘size’ (or ‘magnitude’). In such cases, ISO 704:2009-6.5.4 allows a ‘negative definition’ [9].

The term “attribute” has sometimes been used to designate ‘nominal property’, but not here.

The term “qualitative property” is also used, but not here as it is ambiguous because ‘ordinal quantity’ is often included under that term.

‘Nominal property’ is sometimes termed “nameable property”, but not here.