Function chord_symbol_to_braille 

pub fn chord_symbol_to_braille(
    chord_symbol: &ChordSymbol,
    descending: bool,
    show_octave: bool,
) -> Option<Transcription>

A chord symbol written as the chord it spells, for its own length: music21’s chordToBraille given a ChordSymbol. A symbol as written takes no time and so gives the exception sign, its English naming the symbol by its figure. Nothing for a symbol that spells no pitches.