Electronic Support 
Errored Seconds 
End System 
Errored Second 
Employment Service 
Error Seconds 
expert system 
EARTH SENSOR 
El Salvador 
electronic switch 
Elementary Stream 
end systems 
epidural steroids 
escape system 
Executive Secretariat 
Earned Schedule 
Earth Science 
Earth Station 
echo sounding 
electrical stimulation 
Electronic Systems 
embryonic stem 
Encoding Scheme 
Environmental Sciences 
Equipment Section 
Error Second 
European Standard 
exclusive session 
Experiment Segment 
extra segment