<mp-units/framework/unit.h>
struct pi final : named_unit<symbol_text<3UL - 1, 3UL - 1>{u8"\317\200", "pi"}, mag<pi_c> * one>
named_unit<symbol_text<3UL - 1, 3UL - 1>{u8"\317\200", "pi"}, mag<pi_c> * one>