hyperreal number
A mathematical term from nonstandard analysis; refers to an extension of the real numbers that includes infinitesimals and infinite numbers.
Hyperreal numbers are a number system that includes infinitesimals and infinities.
Compound of 超 (chō, 'super' or 'hyper') and 実数 (jissū, 'real number'), directly translating the English mathematical term 'hyperreal number'.