All articles starting with P
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Pentagón Jr.
Pentagón Jr. (Penta El Zero Miedo, Pentagon Dark, Penta), Mexican masked wrestler born 1985; Cero Miedo persona, Lucha Brothers with brother Fénix, Lucha Underground, AEW Death Triangle, WWE from 2025.
Pentagon Memorial
The Pentagon Memorial in Arlington, Virginia, honors the 184 people killed when Flight 77 hit the Pentagon on September 11, 2001. Designed by Julie Beckman and Keith Kaseman from over 1,100 competition entries, it features 184 stainless-steel benches arranged by victims' ages and was dedicated September 11, 2008.
Pentagon Papers
The Pentagon Papers, officially the Report of the Office of the Secretary of Defense Vietnam Task Force, is a 7,000-page secret U.S. Vietnam War history, leaked by Daniel Ellsberg and published by the New York Times from June 13, 1971, leading to the 6-3 prior-restraint ruling New York Times Co. v. United States.
Pentagon pizza theory
Pentagon pizza theory, or Pentagon Pizza Index, is a folk OSINT idea that late-night pizza-order spikes near the Pentagon presage US military action; popularized by Domino's franchisee Frank Meeks, revived in 2024 by the Pentagon Pizza Report tracking Google Maps data, and never statistically validated.
Pentagon UFO videos
Pentagon UFO videos: FLIR1, GIMBAL, and GOFAST, three Navy F/A-18 infrared clips from 2004 and 2015 leaked via the 2017 New York Times, authenticated and released by the DoD in April 2020; GOFAST later resolved as parallax, FLIR1 and GIMBAL unresolved.
Pentagonal number theorem
The pentagonal number theorem is an identity of Leonhard Euler stating that ∏(1 − x^m) equals a series with generalized pentagonal-number exponents, underlying his recurrence for the partition function.
Pentagone
Pentagone is an eleven-track, hour-long studio album by the Congolese soukous band Wenge Musica, recorded in Paris and released in 1996, the last before the band's 1997 split.
Pentagram
A pentagram, also called a pentacle or pentalpha, is a five-pointed star polygon {5/2} whose points each measure 36 degrees and which is filled with golden-ratio proportions.
Pentagram (band)
Pentagram, the American doom metal band from Arlington, Virginia formed in 1971 (not the Turkish Mezarkabul), fronted by Bobby Liebling; debut album 1985 (Relentless), pioneers with Saint Vitus and Trouble.
Pentagramma triangularis
Pentagramma triangularis, the gold-back fern (gold fern, goldenback fern), a perennial Pteridaceae fern native from Vancouver Island to Baja California, with white or yellow farina on frond undersides, rock-crevice habitat, and a 1990 taxonomic revision splitting it from Pityrogramma.
Pentaho
Pentaho is a Java-based business-intelligence and data-integration software suite combining ETL, reporting, OLAP analysis, and data mining; founded in 2004, it has been owned by Hitachi Vantara since 2017.
Pentair
Pentair plc is an Irish-domiciled water solutions company managed from Golden Valley, Minnesota, selling pool equipment, water treatment systems, and pumps in more than 150 countries.
Pentalayer graphene
Pentalayer graphene is a stack of five single-atom-thick carbon sheets whose properties depend on stacking; its rhombohedral form hosts superconductivity, magnetism, and quantum anomalous Hall effects.
Pentalene
Pentalene is a bicyclic hydrocarbon, C₈H₆, made of two fused five-membered carbon rings and known as the archetypal antiaromatic hydrocarbon, so reactive it dimerizes above −196 °C.
Pentalogy of Cantrell
Pentalogy of Cantrell (Cantrell syndrome, thoraco-abdominal syndrome) is a rare, usually lethal congenital syndrome of five midline defects: abdominal wall, lower sternum, anterior diaphragm, pericardium, and heart, with ectopia cordis common and survival around 37 percent.
Pentalpha
Pentalpha is a solitaire puzzle from Crete played on a five-pointed star: nine counters are placed on ten points via a one-two-three straight-line counting move. Also called Christmas Star; related to Heptalpha and Lam Turki.
Pentamerus
Pentamerus (Sowerby, 1813) is an extinct genus of large pentameride brachiopods, type species P. oblongus, abundant in Silurian (Llandovery) rocks of Laurentia, Baltica, and Siberia; South Chinese forms are now assigned to Sulcipentamerus.
Pentamidine
Pentamidine is an aromatic diamidine antiprotozoal drug synthesized in the late 1930s, used against first-stage sleeping sickness and leishmaniasis, and as a second-line treatment for Pneumocystis pneumonia.
Pentamode metamaterials
Pentamode metamaterials, sometimes called meta-fluids, are artificial solids that behave mechanically like liquids, resisting compression but deforming freely under shear; they were first theorized in 1995.
Pentane
Pentane, also called amyl hydride, is a flammable liquid alkane, C5H12, from natural gas and crude oil, used as a laboratory solvent and foam blowing agent.
Pentangle (band)
Pentangle: British folk-jazz quintet formed in London 1967 (Jansch, Renbourn, Thompson, Cox, McShee); Basket of Light hit UK number five; dissolved 1973, reunited 1982 and 2007–2011.
Pentanochlor
Pentanochlor (solan, CMMP), CAS 2307-68-8, is a selective anilide herbicide inhibiting photosystem II, used pre- and post-emergence in carrots, celery, and tomatoes; first reported 1960, not approved in the EU.
Pentao Liu
Pentao Liu, published as Pengtao Liu, is a stem cell biologist and professor at the University of Hong Kong known for developing Expanded Potential Stem Cells.
Pentaphyllum
Pentaphyllum: an extinct rugose coral genus (de Koninck, 1872, type species P. armatum, revised by Fedorowski 2009), also an illegitimate botanical name for Potentilla (Hill 1756), and a five-leaved species epithet in Gynostemma, Tropaeolum, Acer, and others.
Pentaprism
A pentaprism is a five-sided glass prism that bends light by exactly 90° regardless of the entry angle, used in surveying instruments, optical metrology, and SLR viewfinders.
Pentaquark
A pentaquark is an exotic hadron made of four quarks and one antiquark, first confirmed by CERN's LHCb experiment in 2015 and long predicted by the quark model.
Pentarchy
The pentarchy, or patriarchal pentarchy, is the theory that the early Church was governed by five patriarchal sees ranked as Rome, Constantinople, Alexandria, Antioch, and Jerusalem.
Pentarchy of 1933
The Pentarchy of 1933 (Spanish: la Pentarquía) was a five-member civilian executive commission that governed Cuba for about five days in September 1933, after the Sergeants' Revolt toppled President Carlos Manuel de Céspedes.
Pentasomy X
Pentasomy X (49,XXXXX syndrome, penta X syndrome) is a rare female-only chromosomal condition with five X chromosomes, first reported in 1963, causing intellectual disability, short stature, and congenital malformations.
Pentathlon
Pentathlon: a five-event competition. Ancient Greek pentathlon (long jump, discus, javelin, stadion, wrestling); modern pentathlon, created by Coubertin for Stockholm 1912, now fencing, swimming, laser run, with obstacle replacing riding from LA 2028; also an indoor athletics pentathlon.