sort by Rank | Alpha
| Possible Meanings | Rank |
| Established Church of Scotland | **** |
| Employee Car Ownership Schemes | *** |
| Enrollment Change of Status | *** |
| Education and Career Opportunities System | *** |
| Embedded Cost of Service | *** |
| Efficiency Costs Optimization Simulation | *** |
| End Class of Service | *** |
| Environmental Confederation of Southwest | *** |
| Environmental Conservation Online System | *** |
| Environmental Coordination Office of Students | *** |
| Education for Children Out of School | *** |
| European Coalition on Oil in Sudan | *** |
| Efficiency Cost Optimization Simulation | *** |
| Environmental Clearinghouse of Schenectady | *** |
| Environmental Council of Stamford | *** |
| Estuarine Coastal and Ocean Science | *** |
| European Convention on Security | *** |
| European Cataract Outcome Study | *** |
| Environmental Coastal and Ocean Sciences | *** |
| Electronic Check Out System | *** |
| Electronic Commerce Online System | *** |
| Executive Control of State | *** |
| Educational and Career Opportunities System | *** |
| Exercise Causality Orientations Scale | ** |
| Empowered Committee of Secretaries | ** |
| Electronic Client Ordering System | ** |
| East Coast Office Systems | ** |
| Ecology Center of the Siskiyous | ** |
| Education and Career Opportunity System | ** |
| Environmental Communique of the States | ** |
| Electronic Change of Status | ** |
| Ecological Coalition of Students | ** |
| Eldon Center for Office Solutions | ** |
| Environment Committee of Ottawa South | ** |
| Environmentally Concerned Organization of Students | ** |
| Earthquake Catalog of Switzerland | ** |
| European Cleanroom Office Systems | ** |
| Earthquake Catalogue of Switzerland | ** |
| European Conference on Organic Solar | ** |
| Eckerd College Organization of Students | ** |
| Examinations Council of Swaziland | ** |
| E Commerce OPERATIVE SCALABLE | ** |
| Environmentally Conscious Organization of Students | ** |
| Environmental Committee of Ottawa South | ** |
| Executive Council of Students | ** |
| Edmonds Center for Outpatient Surgery | ** |
| Environmental Coalition of Students | ** |
| Electronic Computer Outlet Services | ** |
| Enhanced Care Outreach Services | ** |
| Enhanced Combat Optical Sight | ** |
| East County One Stop | * |
| Electrical Check Out System | * |
| Electronic Customised Option System | * |
| Educational Combinatorial Object Server | * |
| Engineers for Community Service | * |
| Enhanced Combat Optical Sights | * |
| Environment Council of the States | * |
| Environmental Center for Our Schools | * |
| Environmental Club of Scarborough | * |
| European Community of Stone | * |
| Evolutionary and Complex Systems | * |
| Environmental Construction and Operations Services | * |
| Environmental Community of Students | * |
| Environmental Community Outreach Society | * |
| Early Childhood Observation Scale | * |
| Edison Cost of Service | * |
| Employee Certificate of Service | * |
| Environmental Counsel of States | * |
| External Chemistry and Outsourcing Services | * |
| Lite E-Commerce Operative Scalable Solution for SMEs | * |
| Eberly College Of Science | * |
| Environmental Commissioners of States | * |
| Environmental Commissioners of the States | * |
| Environmental Council of Sacramento | * |
| European Conference of Security | * |