| E&I | Electrical and Instrumentation 
| Others |
| E&I | Engineering and Installation
| Others |
| EI | A Emergency Income
| Others |
| EI | Aer Lingus
| Others |
| EI | Ear Impression
| Others |
| EI | Early Implementer
| Others |
| EI | Early Intervention
| Others |
| EI | Earned Income
| Others |
| EI | East Indian
| Others |
| EI | East Indies
| Others |
| EI | Easy Install
| Others |
| EI | Easy Intelligence
| Others |
| EI | Eating Inventory
| Others |
| EI | Echo Intensity
| Others |
| EI | Ecological Integrity
| Others |
| EI | Ecology Inspector
| Others |
| EI | Edmonton injector
| Others |
| EI | Educational and Informational
| Others |
| EI | Educational Institute
| Others |
| EI | Edwin Ip
| Others |
| EI | Effective Information
| Others |
| EI | Einstein Integration
| Others |
| EI | Electric Image
| Others |
| EI | Electrical Injury
| Others |
| EI | Electrical Insulation
| Others |
| EI | Electrolyte Imbalance
| Others |
| EI | Electromagnetic Interference (irregular form, usually EMI)
| Others |
| EI | Electron Ionization
| Others |
| EI | Electronic Ignition
| Others |
| EI | Electronic Incantations
| Others |
| EI | Electronic Interface
| Others |
| EI | Electronic Intifada
| Others |
| EI | Electronics Interface
| Others |
| EI | Electrons And Ions
| Others |
| EI | Electrostatic Interactions
| Others |
| EI | Elementary Indicator
| Others |
| EI | Elongation Index
| Others |
| EI | Elution Inhibition
| Others |
| EI | Embedded Internet
| Others |
| EI | Emergence Index
| Others |
| EI | Emotional Impact
| Others |
| EI | Emotional Intelligence
| Others |
| EI | Emotionally Impaired
| Others |
| EI | Emotionally Intelligent
| Others |
| EI | Emphysema Index
| Others |
| EI | Employee Involvement
| Others |
| EI | Employment Insurance
| Others |
| EI | Enable Interrupt
| Others |
| EI | Encryption Item
| Others |
| EI | Encryption Items
| Others |
| EI | Encyclopaedia of Islam
| Others |
| EI | End Inspiration
| Others |
| EI | End Item
| Others |
| EI | Ending Inventory
| Others |
| EI | Endotracheal Intubation
| Others |
| EI | Engineer Intern
| Others |
| EI | Engineering Index
| Others |
| EI | Engineering Information
| Others |
| EI | Engineering Initiatives
| Others |
| EI | Engineering Instruction
| Others |
| EI | Engineering Intent
| Others |
| EI | Engineering Intern
| Others |
| EI | Engineering Investigation
| Others |
| EI | English Intermediate
| Others |
| EI | Enhanced Image
| Others |
| EI | Enhancement I
| Others |
| EI | Enter Immortal
| Others |
| EI | Enterprise Integration
| Others |
| EI | Entry Interface
| Others |
| EI | Environmental Illness
| Others |
| EI | Environmental Impact
| Others |
| EI | Environmental Information
| Others |
| EI | Enzyme Inhibitor
| Others |
| EI | Equipment Integration
| Others |
| EI | Erythema Induratum
| Others |
| EI | Erythema Infectiosum
| Others |
| EI | Erythroblastic Island
| Others |
| EI | Essex Institute
| Others |
| EI | Establishent Inspection
| Others |
| EI | Establishment Inventory
| Others |
| EI | Estimated Inner
| Others |
| EI | Ethernet Interface
| Others |
| EI | European Identity
| Others |
| EI | Evans Index
| Others |
| EI | Everything Included
| Others |
| EI | Evil Incarnate
| Others |
| EI | Executive Instrument
| Others |
| EI | Exercise Item
| Others |
| EI | Exercise-Induced
| Others |
| EI | Existential Innuendo
| Others |
| EI | Exponential Integral
| Others |
| EI | Export India
| Others |
| EI | Exposure Index
| Others |
| EI | Extended inventory
| Others |
| EI | Extensor Indicis
| Others |
| EI | External Identifier
| Others |
| EI | External Input
| Others |
| EI | External Intercostal
| Others |
| EI | ExternalInterface I
| Others |
| EI | Extra Instruction
| Others |
| EI | Extrapolation Impaired
| Others |
| EI | Extrinsic Incubation
| Others |