Signalling Peer Process 
Sequenced Packet Protocol 
Serial Port Profile 
Science Power Platform 
Standard Parallel Port 
Solar Pumped Plasma 
Sequence Packet Protocol 
Service Provision Point 
Simulation Planning Panel 
Software Protection Platform 
Space Payloads and Projects 
Science and Power Platform 
Signal Processing Platform 
Sponsor Program Proposal 
standard practice procedure 
Surface Preparation Processes 
Safety Program Plan 
Scalable Parallel Processing 
Scalable Parallel Processor 
Scientific and Power Platform 
Security Package Provider 
Security Program Plans 
Service Provider Process 
Service Provisioning Platform 
Sierra Pacific Power 
Signal Preprocessor 
Silicon Packet Processor 
Single Port Protocol 
Small Power Producer 
Standard Play Plus