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PEP may refer to:

In computing:

• Packetized Ensemble Protocol, used by Telebit modems
• Personal Eventing Protocol, a protocol using the XMPP publish-subscribe protocol to broadcast state change events associated with an instant messaging and presence account
• pretty Easy privacy (pEp), a project for comprehensive encryption
• Python Enhancement Proposal, a public design document for the Python programming language
• Packet Exchange Protocol, a networking protocol from Xerox; see Xerox Network Systems § Transport layer protocols
• Performance-enhancing proxy, mechanisms to improve end-to-end TCP performance
• Policy Enforcement Point, interference point for access control in the XACML access-control model

In organizations:

• Provincial Emergency Program (British Columbia)
• Priority Enforcement Program, a program for U.S. immigration enforcement to seek cooperation from state and local law enforcement agencies in immigration enforcement
• The consortium for the Promotion of European Passive Houses
• Political and Economic Planning, a British think tank formed in 1931
• Politically exposed person, a financial classification
• Promoting Enduring Peace, a UN non-governmental organization
• Propellants, Explosives, Pyrotechnics, a peer-reviewed chemistry journal
• Proper Executive Permission, where the person being asked to make a decision lacks the authority to make a decision, and requires approval from someone higher up the corporate ladder, typically an executive.

In biology and medicine:

• 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
• Phosphoenolpyruvic acid, a biochemical compound
• Pre-ejection period, as measure for the inotropic status of the heart in impedance cardiography
• Positive expiratory pressure or positive airway pressure, a method of respiratory ventilation in the treatment of sleep apnea
• Gel electrophoresis of proteins, also called protein electrophoresis

In physics:

• The Pep reaction, a stellar nuclear fusion reaction that produces deuterium and neutrinos

Other:

• PEP and PEP-II, particle experiments; see Stanford Linear Accelerator Center § PEP and Stanford Linear Accelerator Center § PEP-II
• Peak envelope power, a measure of radio transmitter signal strength
• Pairwise error probability, a measure of digital communication error probability
• Peppermint, particularly in connection with drinks
• Personal Equity Plan, a historical form of tax-privileged investment account in the UK
• Passaporte Electrónico Português, a biometric Portuguese passport
• Primary Entry Point, a distributor of a nationwide Emergency Alert System alert
• Primate Equilibrium Platform, a device used in animal experimentation and training
• Pulsed energy projectile, a type of non-lethal weapon employing laser pulses
• New York Stock Exchange symbol for PepsiCo
• Private equity partnership
• Pauli exclusion principle

See also:

• Pep (disambiguation)

• Disambiguation pages