Numbered rehearsal marks with additional symbols like segno

[Andrii Senkovych]

Dear lilypond hackers,

I want to place numbered rehearsal marks together with segno or coda
signs and I've found just about the right way to do this in the
Lilypond Snippets[1]. However, the snippet uses letters and markletter
function to define them. Unfortunately I didn't find which command
will place numbers instead of letters. I tried marknum adn marknumber
with no success (obviously, there are no such markup commands in
lilypond).

How is (or can be) this markup command defined?

-- 
Thanks,
Andrii Senkovych