- Fifth letter of the English Alphabet.
- Education, e.g. IIE (Institute of International Education)
- Engineering. e.g. ChE (Chemical Engineering)
- Estimate, e.g. ETA (Estimated Time of Arrival)
- Executive, e.g. EC (Executive Committee), CEO (Chief Executive Officer)
- Exponent. e.g. 1E6 (stands for a million) and 1E-6 (stands for a millionth).
- e is a Mathematical Constant named in honor of Euler. It has a value of 2.71828…
- e^x (is the Euler Constant raised to the power x).
- Differentiating e^x returns e^x.
- Integrating e^x returns e^x.
- The invariant property of e^x is essential to the Transforms and Transformations (used for the Analysis and Synthesis in Engineering problems).
- E : Electrical, Electronic, Electronics, Executive, Exponent, English, Engineering
- EC — Electrical Communications; Executive Committee
- ECAP — Electrical Circuit Analysis Program
- EE– Electrical Engineering
- EEC : European Economic Commission
- EI : Emotional Intelligence, Electrical Inspectorate
- EMR — Electronic Medical Record
- EP — Electrical Power.
- EPC — Electric Power Corporation
- EQ — Emotional Quotient, Equality
- ER — Emergency Room; Emergency Responder
- ESL — English as a Second Language; English as a Specialty Language
- ESP — Extra Sensory Perception
- ETA — Estimated Time of Arrival
- ETD — Estimated Time of Departure
- EU — European Union
- EV — Electric Vehicle
- EVA — Extravehicular Activity
- EWS — Early Warning System
- EZ — Easy
- IEEE — Institute of Electrical and Electronic Engineers
- IEEE-CS — Computer Society of IEEE
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