Hello,
someone asked me to help with making orchestral parts, and they have written “we have the complete Petrucci PO”.
I guess this has to do something with the file format. Could someone please help me solve the mystery?
A couple of wild guesses -
Maybe Petrucci is a font. If it is, I have no idea what PO would stand for.
Petrucci is a name associated with the International Music Score Library Project (IMSLP) - https://imslp.org/
It’s the original Finale font. No idea what PO means in that context though.
Wouldn’t be Post Office, Petty Officer, Pensions Ombudsman, Pretty Odd, etc.
Might possibly stand for printout.
are you unable to ask them what they mean?
They might respond with more abbreviations!
print out
Thank you for your answers.
PO=print out makes most sense to me.
The person who asked me is actually French so it could also have a different meaning in this context .
I am waiting for a reply once it is daylight again.
If it’s french, perhaps Projet Original?
“Parts orchestrale”? I have no idea. 
IIRC Early versions of Finale offered Petrucci in two sizes. During one upgrade cycle, Coda Music changed the default size of Petrucci for the newer version. Perhaps the PO designation was used to distinguish between the two versions. Just a thought.
That would be “Partie Orchestrale” 
Never heard that! There’s only been one name for the Petrucci font that I know of. And I have some old versions of Finale!
oh, how beautiful to see the old Macintosh finder!
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I received an answer:
here PO or OP stands for Partition d’Orchestre.
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So presumably they mean the score from IMSLP (“Petrucci”)…?
yes, exactly.
And just like that, this thread lost most of its magic. 
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One name, but there was another “size”…
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Good fact! I must have missed it in the original thread.
Interestingly, the last MM font installer package I have from 2010 installs “version 1.0” of Petrucci, so God knows how they tell the difference.