Scanning Probe Microscopy 
Scanning Probe Microscopes 
Scanning Probe Microscope 
self-phase modulation 
Software Programmer's Manual 
Single Point Mooring 
System Performance Monitor 
Solar Proton Monitor 
Source Program Maintenance 
suspended particulate matter 
Sequential Processing Machine 
Solar Power Module 
Subsystem Project Manager 
System Program Manager 
Satellite Propulsion Module 
scanning proton microprobe 
Security Policy Model 
Self-Propelled Mount 
Service Provider Messages 
Session Protocol Machine 
Set Program Mask 
Shared Property Manager 
Ship Program Manager 
Shots Per Minute 
Significant Permit Modification 
single port manager 
Software Performance Monitor 
Software Project Management 
Special Purpose Monitoring 
Spectrum Peripheral Module