PPN definitions

PPN

Is the Private Placement Number.
Found on http://www.oasismanagement.com/glossary/

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PPN

Proto-Planetary Nebula, an object that has partially evolved from a red giant to a planetary nebula
Found on http://www.translationdirectory.com/glossaries/glossary142.htm

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PPN

Partial parenteral nutrition
Found on https://www.encyclo.co.uk/local/22446

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