140 SIR definitions

Supplemental Inflatable Restraint 
Shuttle Imaging Radar 
Sustained Information Rate 
Standard Interface Rack 
Society of Interventional Radiology 
Software Initiated Restart 
Serious Incident Report 
Sierra 
Surface Insulation Resistance 
selected ion recording 
Selective Information Retrieval 
signal-to-interference ratio 
Spaceborne Imaging Radar 
specific information requirements 
SPICER 
Statistical Inventory Reconciliation 
Submarine intermediate reactor 
Symbolic Input Routine 
System Interface Requirements 
safe integral reactor 
safeguards implementation report 
Savings to Investment Ratio 
self-insured retention 
Serial InfraRed 
Serial Infrared data transmission 
Serious Incident Reports 
Signal to Interference Ratio 
single isomorphous replacement 
Snow and Ice on Runway 
Spaceborne Imaging Radars