Hello
You run an extremely high risk not getting one single useful answer, not
telling anything whatsoever about the context of your question.
Is it something you can't find in the documentation or is it for use in
compilng a score?
In the latter case, provide a minimal example, please.
And always, with what lilypond version? Sometimes it also helps when
answering, knowing the computewrs' operating system and version.
--
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