English abbreviations from sdn to sdr
- SDN (Sandane Airport, Anda)
- SDNMC (San Diego Naval Medical Center)
- SDNRIU (Secure Digital Net Radio Interface Unit)
- SDNS (Secure Data Network System)
- SDO (Standard Development Organization)
- SDOR ((celestial object) S DORadus, a class of eruptive variable stars named after S Doradus, the archetype for the class)
- SDOS (Sum of Defeated Opponents' Score)
- SDP (Sand Point Airport)
- SDPBH (SDP Bottom Hole Pressure Report)
- SDPD (Structure Determination from Powder Diffraction)
- SDPO (Site Defense Project Office)
- SDQ (Las Américas International Airport)
- SDR (Santander - Parayas Airport)