Double whole note (breve), single vertical strokes
Look here: https://w3c.github.io/smufl/latest/tables/individual-notes.html (at the very end of this subpage)
Please add this glyph as soon as it is available in music fonts.
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Comments
It pretty surely is in Bravura already
In reply to It pretty surely is in… by Jojo-Schmitz
Great. When will it be chooseable in MuseScore?
In reply to Great. When will it be… by Klaus Meglitsch
If you use Emmentaler or Leland it is the default
How to reach those stylistic alterenatives in general is beyond me though