Periodic system of elements, that is, the periodic table

Pale, Soft, Exudative, meat having a pH below 5.6

Producer Support Estimate, a measure published by the OECD

Professional Stamp Experts, postage stamp grading and authentication service used as an aid in Philatelic investment. A stamp with a PSE certificate has been verified to be genuine by this service.

Party of European Socialists (French: Parti socialiste européen (PSE)

Pseudoephedrine (commonly abbreviated as PSE) is a sympathomimetic amine commonly used as a decongestant. The salts pseudoephedrine hydrochloride and pseudoephedrine sulfate are found in many over-the-counter preparations either as single-ingredient...

Point of subjective equality, the point in psychophysics where the subject perceives two different stimuli to be the same

Photosensitive epilepsy

Pi Sigma Epsilon, the only national, co-ed, professional fraternal organization in sales, marketing, and management

Pidgin Signed English

Philippine Stock Exchange

Page Size Extension, paging mechanism in computer microprocessor

Partido Socialista de Euskadi, Basque affiliate of the Spanish Socialist Workers' Party

Photoshop Elements, a consumer image manipulation program from Adobe

Puget Sound Energy

Paris School of Economics, a French academic foundation located in Paris

Prague Stock Exchange

Personal and Social Education, component of the state school curriculum in Britain

PSE as in Product Safety Electrical Appliance & Material, a Japanese standard for electrical appliance safety.

Problem Solving Environment

Polskie Sieci Elektroenergetyczne, a Polish energy company

PSE is the IATA code for Mercedita Airport, and an abbreviation for:

Power sourcing equipment which brings electricity to PoE devices