English abbreviations from pdr to pdu
- PDR (a photodissociation region or photon-dominated region (both terms are used synonymously); a region in the neutral ISM in which far-ultraviolet photons dominate the heating and chemistry)
- PDRL (Permanent Disability Retirement List)
- PDRR (Program Definition and Risk Reduction)
- PDRY (People's Democratic Republic of Yemen (obsolete since 1990))
- PDS (Permanent Duty Station)
- PDSA (PeroxyDiSulfuric Acid)
- PDSB (Peel District School Board (Ontario, Canada))
- PDSC (Public Diplomacy and Strategic Communication)
- PDSH (Pressure Differential Switch High)
- PDSP (Property Data Survey Programme)
- PDSS (Post-Deployment Software Support)
- PDSSC (PDSS Center)
- PDST (Pulsed Dipole Sonic Tool)
- PDT (Pacific Daylight [Saving] Time (UTC-7 hours))
- PDU (Tydeo Larre Borges International Airport)