| Electronic Commerce Server | Academic & Science |
| Electronic Clearing System | Academic & Science |
| Electronic Credit Settlement | Academic & Science |
| Electrochemical Society | Academic & Science |
| Electronic Control System | Academic & Science |
| Electronic and Computer Science | Academic & Science |
| Electronics and Computer Science | Academic & Science |
| Engineering Computer Simulations | Academic & Science |
| Electronic Claim Submission | Academic & Science |
| Engineering and Computer Simulations | Academic & Science |
| Electronic Citation System | Academic & Science |
| European Cetacean Society | Academic & Science |
| Electronic Claims Submission | Academic & Science |
| Newcastle (wy) | Airport Code |
| Electronic Clearing Service | Banking |
| Electronic Clearing Services | Banking |
| Engineering Career | Business |
| Enhanced Customer Service | Business |
| Early Career Scientists | Business |
| Educational Construction Set | Business |
| Engineered Compost Systems | Business |
| Energy Consumption Saver | Business |
| Elitegroup Computer Systems | Business |
| Engineering Career Services | Business |
| Electronic Control Services Company | Business |
| Electrosteel Castings | Business |
| ECSI, LTD. | Business |
| Engineering Capture System | Business |
| Economic Consultancy House | Business |
| Engineering Computer Services | Business |
| Electronic Controlled Suspension | Business |
| Educator Certification System | Certifications |
| Electrotechnical Certification Scheme | Certifications |
| Emmaus Correspondence School | Community |
| English Communications Service | Community |
| Educational Cost Sharing | Community |
| Education, Culture, and Science | Community |
| Education Commission of the States | Community |
| Exceptional Children Services | Community |
| Episcopal Community Services | Community |
| Educational and Community Services | Community |
| Evangelical Christian School | Community |
| Early Childhood Services | Community |
| Ethical Culture School | Community |
| Emergency Calling Service | Computer and Networking |
| Expert Control System | Computer Hardware |
| Electronic Customer Support | Computing |
| Experiment Control System | Computing |
| Eof Core System | Computing |
| Elitegroup Computer System | Computing |
| Edit Configuration System | Computing |
| Error Correction System | Computing |
| Extended Character Set | Computing |
| Enhanced Chip Set | Computing |
| Enhanced Communications Server | Computing |
| Embedded Computer System | Computing |
| European Computer Science | Computing |
| European Communications Satellite | Computing |
| Embedded Control Systems | Computing |
| Ethernet Connectivity Solutions | Computing |
| Entertainment Computer System | Computing |
| Encrypted Compressed Gis Software | Computing |
| Electronic Commerce System | Computing |
| Electronic Commerce Services | Computing |
| Engineering and Computer Science | Computing |
| Embedded Computer Systems | Computing |
| Electronic Communications Service | Computing |
| Electronic Cross-Connect System | Computing |
| Enterprise Cloud Services | Computing |
| Enter Cloud Suite | Computing |
| Enterprise Cyber Security | Computing |
| E-Commerce Summit | Computing |
| E-Commerce Service | Computing |
| E-Commerce Solution | Computing |
| Edinburgh Computer Services | Computing |
| Exploring Computer Science | Computing |
| Educational Computer Strategist | Computing |
| Encryption Control System | Computing |
| Ecuador Sucre | Country Currency |
| Electronic Chart System | File Type |
| Electric Charging Station | General |
| Electronic Charging Station | General |
| Equivalent Car Space | General |
| Echantillon Carnet Sample | General |
| Elastic Cloud Storage | General |
| Experience Centered Seminar | General |
| Empire City Subway | General |
| Exceptional Customer Service | General |
| EC2 Container Service | General |
| Entity Component and System | General |
| EOSDIS Core System | General |
| Esports Championship Series | General |
| Enhanced Cybersecurity Services | General |
| EC2 Cluster Service | General |
| Entity Component System | General |
| Elastic Common Schema | General |
| Elastic Container Service | General |
| Extended Chirp Scaling | General |
| Environment Control System | General |
| Earth Cargo Ship | General |
| Emerald City Supporters | General |
| English Club of Slipi, Jakarta, Indonesia | General |
| Extended Color Savings | General |
| Electrically Controlled Suspension | General |
| Exon Complementary Sequence | General |
| Electronic Crash Sensor | General |
| Emission Control System | General |
| Evaporation Control System | General |
| Early Crash Sensor | General |
| Electronically Controlled Suspension | General |
| Engine Crank Switch | General |
| Engineering Control Systems | General |
| East Coast Supercharging | General |
| Engine Coolant System | General |
| Electronic Control Power Steering | General |
| Engineering Change Schedule | General |
| Electronic Clutch System | General |
| Elantra Club Singapore | General |
| Engineering Center Steyr | General |
| European Car Sharing | General |
| Enterprise Car Share | General |
| Electromobil Club de Suisse | General |
| e-Tron Charging Service | General |
| Exotic Car Spotters | General |
| Environmental Compliance Services | Governmental |
| Energy Communications and Services | Governmental |
| Employment Contractor Services | Governmental |
| Energy Communication and Services | Governmental |
| Environmental Charter School | Governmental |
| Ethics Compliance Standard | Governmental |
| Education Cost Sharing | Governmental |
| Executed Contract System | Governmental |
| Environmental Composite Systems | Governmental |
| Entity Coordinate System | Maths |
| Element Construction Set | Maths |
| Edge Composite System | Maths |
| Endocervical Swab | Medical |
| Eligible clinicians | Medical |
| ElectroCerebral Silence | Medical |
| Equipment Concentration Site | Military and Defence |
| Engineer Combat System | Military and Defence |
| Exercise Control System | Military and Defence |
| Engagement Control Station | Military and Defence |
| Expeditionary Combat Support | Military and Defence |
| Enterprise Control Station | Networking |
| Event Correlation Services | Networking |
| Eddy Covariance System | Physics Related |
| Ecuadorian Sucres | Regional |
| Ecuadorian Sucre | Regional |
| Engine Control System | Space Science |
| Environmental Control System | Space Science |
| Eosdis (earth Observing System Data and Information System) Core System | Space Science |
| Eof (experimenters Operations Facility) Core System | Space Science |
| Extreme Combat Specialists | Sports |
| Emergency Communication System | Telecommunication |
| Mondell Airport | Transport & Travel |