abstract number
A number considered independently of any concrete unit or object; used in mathematics to distinguish pure numbers from concrete numbers (名数).
See also: 名数
An abstract number is a number without an accompanying unit.
In math class, we learned the difference between abstract numbers and concrete numbers.
From 無 (without) + 名 (name) + 数 (number), literally 'nameless number'. The term is a direct calque of the English 'abstract number'.