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PEP may refer to:

In computing:

• Packet Ensemble Protocol, used by Telebit modems
• PEP tool, a programming environment based on Petri nets
• Presence Enabled Phonebook, used in mobile computing
• Protocol Extension Protocol, an extension mechanism for HTTP
• Python Enhancement Proposal, a public design document for the Python programming language
• Packet Exchange Protocol, a networking protocol from Xerox
• Performance Enhancing Proxy, mechanisms to improve end-to-end TCP performance
• Policy Enforcement Point, interference point for access control e.g. a web agent

In organizations:

• Provincial Emergency Program, the emergency Preparedness program in the Province of British Columbia, Canada
• The consortium for the Promotion of European Passive Houses
• Political and Economic Planning, a British think tank formed in 1931
• PEP, a small form factor computer manufacturer, which used, among others the OS-9 operating system, and the Motorola 680x0 CPUs

In biology:

• Polymorphic eruption of pregnancy, British term for condition of Pruritic Urticarial Papules and Plaques of Pregnancy
• Post-exposure prophylaxis, a method of Disease prevention and treatment
• Phosphoenolpyruvate, a biochemical compound
• Pre ejection period - PEP - as measure for the inotropic status of the heart

In other:

• Peak envelope power, a measure of radio transmitter signal strength
• Peppermint, particularly in connection with drinks
• Personal Equity Plan, a form of tax-privileged investment account in the UK
• Portuguese Electronic Passport, a biometric passport issued by Portugal since early 2006
• Positron Electron Project, a Stanford Linear Accelerator Center project
• Primate Equilibrium Platform, a device used in animal experimentation and training
• Pulsed Energy Projectile, a type of non-lethal weapon employing laser pulses
• Policy Enforcement Point
• Politically exposed person, an AML term for a foreign political figure
• PepsiCo, uses PEP as its NYSE symbol
• Private Equity Partnership
• Profits per equity partner, a common measure of profitability for law firms

See also:

• Pep

• Disambiguation pages