5 Quantities and units library [quantities]

5.4 Reference [qty.ref]

5.4.2 Dimension [qty.dim]

5.4.2.5 Symbol formatting [qty.dim.sym.fmt]

template<typename CharT = char, std::output_iterator<CharT> Out, Dimension D> constexpr Out dimension_symbol_to(Out out, D d, const dimension_symbol_formatting& fmt = {});
Effects: TBD.
Returns: TBD.
template<dimension_symbol_formatting fmt = {}, typename CharT = char, Dimension D> consteval std::string_view dimension_symbol(D);
Effects: Equivalent to: TBD.