surreal number
a totally ordered proper class containing the real numbers as well as hyperreal numbers such as infinity and infinitesimals.
en-GB/səˈɹɪəl ˈnʌmbə/
en-US/səˈɹiəl ˈnʌmbɚ/
a totally ordered proper class containing the real numbers as well as hyperreal numbers such as infinity and infinitesimals.