ERP or Erp may refer to:

Acronyms

Economics

* Effective rate of protection of tariffs * Equity risk premium, excess return on risky investments *

European Recovery Program The Marshall Plan (officially the European Recovery Program, ERP) was an American initiative enacted in 1948 to provide foreign aid to Western Europe. The United States transferred over $13 billion (equivalent of about $ in ) in economic re ...

or Marshall Plan

Medicine

Effective refractory period In electrocardiography, during a cardiac cycle, once an action potential is initiated, there is a period of time that a new action potential cannot be initiated. This is termed the effective refractory period (ERP) of the tissue. This period is a ...

, in a cardiac cycle *

Estrogen receptor Estrogen receptors (ERs) are a group of proteins found inside cells. They are receptors that are activated by the hormone estrogen (17β-estradiol). Two classes of ER exist: nuclear estrogen receptors ( ERα and ERβ), which are members of th ...

positive, a cancer pathology test result * Event-related potential, a measured brain response *

Exposure and response prevention Exposure therapy is a technique in behavior therapy to treat anxiety disorders. Exposure therapy involves exposing the target patient to the anxiety source or its context without the intention to cause any danger (desensitization). Doing so is thou ...

, a treatment method in behavioral therapy * OspE/F-like related protein, in Lyme disease microbiology

Other acronyms

Effective radiated power Effective radiated power (ERP), synonymous with equivalent radiated power, is an IEEE standardized definition of directional radio frequency (RF) power, such as that emitted by a radio transmitter. It is the total power in watts that would ...

, of directional radio transmission * ''Ejército Revolucionario del Pueblo'' (disambiguation), (Spanish for People's Revolutionary Army), various Latin American communist or socialist organizations *

Electronic Road Pricing The Electronic Road Pricing (ERP) system is an electronic toll collection scheme adopted in Singapore to manage traffic by way of road pricing, and as a usage-based taxation mechanism to complement the purchase-based Certificate of Entitle ...

, in Singapore * Energy-related products, that use or affect energy consumption *

Enterprise resource planning Enterprise resource planning (ERP) is the integrated management of main business processes, often in real time and mediated by software and technology. ERP is usually referred to as a category of business management software—typically a sui ...

, a business process system

People

* Erp (Pict), father of Drest I of the Picts

Places

* Erp, Ariège, France, a village *

Erp (Germany) Erp is a village in Erftstadt, North Rhine-Westphalia, Germany. It has about 2650 inhabitants (2006). Location and appearance Erp is located 25 km south-west of Cologne in an open and flat landscape about 125 metres above sea level. The muni ...