European Southern Observatory Equipment Smarter than Operator Enforcement Specialist Office European School of Oncology European Space Observatory Education Supervision Order embarkation staff officer Emergency support organization Employee Stock Option esophagus European Space Organization European Standardization Organization Event Sequence Override Avitat Echo Suppressor, Originating Economic Stabilization Office Educational Services Officer Eductional Services Officer Electronics Supply Office embolic signal onset Emergency Service Order Eminence Symphony Orchestra Employee Stock Options Energy Senior Official Energy Senior Officials Engine ShutOff Engineering Security Office Engineering Services Office Entry Server Offering Environmental Sciences Organization
European Southern Observatory
Equipment Smarter than Operator