What does PPU stand for?

Pre Purification Unit

This definition appears very rarely

Other Resources:

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Point Park University (Pittsburgh, Pennsylvania) Portable Pilot Unit (Microsoft) Portable Production Unit Position Pick-off Unit (aviation) Post Processing Unit Postpartum Unit Power Processing Unit (solar electric propulsion) Powerplay Unit (hockey) Praktisk-Pedagogisk Utdanning (Norwegian: Practical Pedagogical Education) Pre Processor Utility		Preproduction Unit Price Per Unit Primary Place of Usage Prime Power Unit Procurement Policy Unit (UK) Production Prototype Unit Professional People in Urbe Programme de Prévention Urbaine (French) Protocol Processing Unit Prvi Partizan Uzice (Serbian ammunition company)