This is the reflection operator. The committee† spent some time bikeshedding different squiggles for this operator, but eventually it looks like ^^ won because

This is the reflection operator. The committee† spent some time bikeshedding different squiggles for this operator, but eventually it looks like ^^ won because it was least awful. † WG21 of SC22 of JTC1 between ISO and the IEC, "the C++ committee". See P2996R11 for the latest draft of the work - https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2025/p2996r11.html#the-reflection-operator https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2025/p29...