- Effective Radiated Power , used in radio communications
- Effective Rate Of Protection , a method of working out the value of import tariffs
- Effective Refractory Period , (Medicine- Cardiac electrophysiology)
- People's Revolutionary Army (Argentina) (''Ejército Revolucionario del Pueblo'')
- People's Revolutionary Army (Colombia)
- People's Revolutionary Army (Mexico)
- Electronic Road Pricing , toll-collection scheme in Singapore
- Enterprise Resource Planning - An Information Technology term referring to a hardware or software system that serves all departments within an enterprise.
- Estonian Reform Party
- European Recovery Program, better known as the Marshall Plan
- Event-related Potential , an electrophysiological response to an internal or external stimulus
- Exposure And Response Prevention , a psychotherapeutic method
- Erotic Role-playing , a sexual form of Role-playing (also Sexual Roleplaying )
- , figure of Norse Mythology
- Erp (Netherlands)
- Erp (Germany) , a village near Cologne
- Engineer Recon Patrol , Warsaw Pact ground forces doctrine, a small detachment out in front of a mech or armored force identifying routes, obstacles and defense works
- "Emergency Response Plan", Compulsory mostly for the large scale civil engineering construction works where there is a high risk of threat to the health, life and/or environment, see HSE .
- Economic Report Of The President , published annually by the United States President's Council Of Economic Advisors on recent economic activity and future policies and predictions.
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