Security Parameters Index 
Security Parameter Index 
Schedule Performance Index 
Software Process Improvement 
Stateful Packet Inspection 
Single Process Initiative 
SCSI Parallel Interface 
Serial Peripheral Interface 
Service Provider Interface 
Security Profile Inspector 
Sierra Pacific Innovations 
Site Population Index 
Society of the Plastics Industry 
Self-Paced Instruction 
Source Packet Indicator 
standard power interface 
Surface Position Indicator 
Swiss Performance Index 
Science Program Implementation 
SDH Physical Interface 
Security Policy Initiative 
Selective Population Inversion 
Sensitive Price Index 
Serial to Parallel Interface 
Service Provider Identifier 
Single Point Injection 
Single Process Initiatives 
Skim Perbankan Islam 
Slagging pyrolysis incinerator 
soy protein isolate