System Program Director 
Security Policy Database 
Software Product Description 
Space Product Development 
Serial Presence Detect 
Speed 
Supplementary Planning Document 
Supplementary Planning Documents 
Solar Physics Division 
Stratospheric Protection Division 
Space Physics Division 
SPEED FLO 
summary plan description 
Surge-Protective Devices 
System Performance Document 
Salmon poisoning disease 
Sample Pulse Driver 
Science Programs Division 
Seattle Police Department 
Security Production Development 
semantic pragmatic disorder 
Serial Parallel Digital 
Service Provider Descriptor 
Signal Processing and Display 
Software Products Division 
Spermidine 
Spool Positioning Device 
spreader 
Standard Practice Directive 
State Programs Division