Institute of Technology, a university in Bangalore, India
Providence Elementary School, an elementary school in Chesterfield County, Virginia

Computing
Pro Evolution Soccer, a multi-platform video game series developed by Konami
Packetized elementary stream, part of the MPEG communication protocol
Peripheral Event System, an implementation of autonomous peripheral operations in microcontrollers
PSTN Emulation System for IP Multimedia Subsystem (IMS)

Organizations
Postal Express Service, United States military mail during World War I
Power Engineering Society, now the Power & Energy Society of the Institute of Electrical and Electronics Engineers
Premier Election Solutions, formerly Diebold Election Systems
Party of European Socialists, a centre-left pan-European political party
Social Encounter Party, a Mexican former political party
Solidarity Encounter Party, a Mexican former political party

Science
Pallasite Eagle Station, a pallasite meteorite grouplet
Photoemission spectroscopy, a measurement of a substances binding energy using the photoelectric effect
Poly(ethylene succinate), a type of polyester
Polyester, an artificially produced organic chemical that is spun and woven to make fabric
Polyethersulfone, a thermoplastic polymer
Potential energy surface, in physics and chemistry
Programmed electrical stimulation, a type of electrophysiologic study
Pseudoexfoliation syndrome, an eye problem

Other
PES (director) (born 1973), film director and animator born Adam Pesapane
Passenger Environment Survey, quality-control system for transit systems
Payment for ecosystem services, incentives offered to farmers or landowners
Pensarn railway station, Gwynedd, Wales, by National Rail station code
Price elasticity of supply, a measure used in economics
PULHHEEMS, a system of grading physical and mental fitness used by Britains armed forces

See also
Pez (disambiguation)
In the end, they concluded their data supported "the theory of catecholamine mediation of these myocardial changes in man and of the lethal potential of stress through its effect on the heart".The first studied case of takotsubo cardiomyopathy was in Japan in 1991 by Sato et al. More cases of the syndrome appeared in Japan within the next decade, although western medicine had still not acknowledged it. The syndrome finally occurred in 1997 when Pavin, et al., wrote about two cases of "reversible LV dysfunction precipitated by acute emotional stress". The western world had not heard of such a thing at the time, as it was incredibly rare and often misdiagnosed. The Japanese at last reported about the syndrome to the west in 2001 under the name "transient LV apical ballooning" though at this point the west had already heard of numerous cases. The syndrome reached international audiences through the media in 2005 when the New England Journal of Medicine wrote about the syndrome.In the bible, when Jacob was told his long lost son, Joseph, is still alive, "his heart faltered, because he did not believe them". The medieval  commentator, Nachmanides, further explains: "This condition is known when joy suddenly comes upon one, and it is mentioned in the books of medicines that old or feeble persons cannot withstand the shock, for many of them faint when joy comes to them very suddenly.