Understanding Surreal numbers is a bit 'surreal'. Good Luck!

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"Surreal numbers are the most natural collection of numbers which includes both the real numbers and the infinite ordinal numbers of Georg Cantor. They were invented by John H. Conway in 1969. Every real number is surrounded by surreals, which are closer to it than any real number."

Source Links:

https://mathworld.wolfram.com/SurrealNumber.html;

'Elementary Theory of Surreal Numbers',

https://www.researchgate.net/publication/328107970_Elementary_Theory_of_Surreal_Numbers.

Remark: Try to wrap your mind around the surreal numbers. Good Luck!