[1] Electronic Switching System {Telefonie}

[2] Executive Support System

[3] Exchange Support System

[4] External Software System

[5] Emplaced Scientific Station (->"IEEE Standard Dictionary")

[6] Engineered Safety System (->"IEEE Standard Dictionary")

[7] Earth and Space Sciences (NASA)

[8] Environmental Stress Screening

[9] Environmental Support System (->"NASA Acronym List")

[10] Effective Sunset (->"NASA Acronym List")

[11] Essential (->"NASA Acronym List")

[12] Experiment Subsystem Simulator (->"NASA Acronym List")

[13] Experiment Support Section (->"NASA Acronym List")