Would someone explain what line 5 does and what "::"means? Why line 6 is not enough.
1 \version "2.19.10"
2 sesquisharp = \markup { \sesquisharp }
3
4 \relative {
5 \once \override Accidental.stencil = #ly:text-interface::print
6 \once \override Accidental.text = #sesquisharp
7 cis''4 }
Thank you, ƒg