268 PES definitions

Professional Engineering Services 
program elements 
Packetized Elementary Stream 
Passenger Entertainment System 
Power Engineering Society 
Performance Evaluation System 
Planning and Evaluation Staff 
Positive Enable System 
Post Ejection Sequencer 
potential energy surface 
Program Elementary Stream 
programmed electrical stimulation 
Proposed Encryption Standard 
Packet over Ethernet over SONET 
Packetised Elementary Stream 
Packetized Elementary System 
Pallet Ejection System 
Personal Earth Station 
photoelectron spectroscopy 
Pitch Enhancement System 
polyethersulfone 
Positioning Error Signal 
potential energy surfaces 
Preliminary Environmental Survey 
preparedness evaluation system 
primary empty sella 
Processor Enhancement Socket 
Professional Examination Service 
Programmable electronic systems 
psychiatric emergency services