Rehearsal marks

[Brett McCoy]

I've read in a few places -- including the Lilypond documentation --
that, traditionally, when using rehearsal marks in a score, the letter
I is skipped. Does anyone know why this is done?

Lilypond handles this automatically, do Finale and Sibelius?

-- Brett
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"In the rhythm of music a secret is hidden;
    If I were to divulge it, it would overturn the world."
               -- Jelaleddin Rumi