Electronic Control Switch 
Electronic Crossconnect System 
Emergency Coolant System 
Echo Control Subsystem 
Ecuadorean Sucre 
Editorial Coordination Services 
Electrical and Communication System 
Electrical Control System 
Electrical, Computer and Systems 
Electromagnetic Compatibility Society 
Electron Captive Spectroscopy 
Electronic Claims Submission 
Electronically Controlled Suspension 
Energy Communication Services 
enfinity Catalog Server 
Engineering and Computer Science 
Environmental Conservation Service 
Etched Circuits Society 
European Ceramic Society 
European Committee for Standardization 
Evaporation Control System 
Expanded Control Store 
Education Code Section 
Effective Cross Section