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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../concepts/relation.html below:

std::relation - cppreference.com

template< class R, class T, class U > concept relation = std::predicate<R, T, T> && std::predicate<R, U, U> && std::predicate<R, T, U> && std::predicate<R, U, T>; (1) (since C++20)

The concept relation<R, T, U> specifies that R defines a binary relation over the set of expressions whose type and value category are those encoded by either T or U.

[edit] References

C++23 standard (ISO/IEC 14882:2024):

18.7.5 Concept relation [concept.relation]

C++20 standard (ISO/IEC 14882:2020):

18.7.5 Concept relation [concept.relation]

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