All articles starting with P

Pilot tunnel

A pilot tunnel, also called a pilot drift, is a small tunnel excavated ahead of a larger tunnel to explore ground conditions and assist final excavation.

Pilot wave theory

Pilot wave theory, also called the de Broglie–Bohm theory or Bohmian mechanics, is an interpretation of quantum mechanics in which particles have definite positions guided by a wave.

Pilot whales (Globicephala) are two species of large social oceanic dolphins: long-finned G. melas and short-finned G. macrorhynchus, known for matrilineal pods, deep dives, mass strandings, and Faroe Islands drive hunts.

Pilot-based channel estimation

Pilot-based channel estimation is a wireless receiver technique in which known pilot symbols are inserted so the receiver can measure and reconstruct the channel, used in LTE, 5G NR, and Wi-Fi.

Oct 22, 2026

Pilot-wave hydrodynamics

Pilot-wave hydrodynamics is the field of fluid dynamics studying droplets that bounce on a vibrating liquid bath and walk across it, guided by their own waves.

Pilotta

Pilotta (Πιλόττα) is a Greek point-trick card game of the Jass family, similar to Belote and Coinche, and Cyprus's favorite card game: 4 players, 2 teams, 32 cards, 3-2-3 deal, 162 points per round, 301 to win.

Pilou Asbæk

Pilou Asbæk (Johan Philip Asbæk, born 1982) is a Danish actor, Bodil and Robert winner for R (2010), known as Kasper Juul in Borgen, Euron Greyjoy in Game of Thrones, Batou in Ghost in the Shell, and The Mule in Foundation season 3.

Pilsdon Pen

Pilsdon Pen: 277m Dorset hill with a small multivallate Iron Age hillfort, two Bronze Age bowl barrows, medieval ridge and furrow, and a post-medieval rabbit warren; excavated 1964-71 and 1982, scheduled monument 1019394.

Pilsner

Pilsner is a pale, golden lager first brewed by Josef Groll in Plzeň, Bohemia, in 1842; its soft hop bitterness became the template for most pale lagers worldwide.

Pilsner Urquell Brewery

The Pilsner Urquell Brewery (Plzeňský Prazdroj) is a brewery in Plzeň, Czech Republic, where the world's first golden pilsner was first brewed by Josef Groll in 1842 and is still made today.

Piltdown Man

Piltdown Man (Eoanthropus dawsoni) was a forged ape-human link from Sussex announced in 1912 and exposed in 1953 as a human skull and orang-utan jaw.

Piltun-Astokhskoye Oil and Gas Field

Piltun-Astokhskoye (Пильтун-Астохское) is an offshore oil and gas field in the Sea of Okhotsk off Sakhalin Island, discovered in 1986 and producing Russia's first offshore oil in 1999.

Pilularia

Pilularia (pillworts) is a genus of seven accepted species of heterosporous aquatic ferns in Marsileaceae, Salviniales, with thread-like bladeless leaves and spherical four-valved sporocarps; sister to Regnellidium, with Marsilea outside that clade.

Pilularia globulifera

Pilularia globulifera (pillwort, Pillenfarn) is a tiny aquatic fern of Marsileaceae, native from Europe to Kazakhstan and Ethiopia, with thread-like leaves and 3 mm round sporocarps; globally Least Concern but nationally scarce and declining in Britain.

Pilum

Pilum (plural pila), the heavy javelin of Roman legionaries, about 2 m long with a pyramidal iron head on a slender shank and wooden shaft, thrown at short range before sword combat; shank designed to buckle, preventing enemy reuse.

Pilus

Pilus (plural pili), also called fimbriae, is a non-flagellar proteinaceous surface appendage of bacteria built from pilin subunits; classes include chaperone-usher, type IV, type IV secretion, type V, curli, and sortase-mediated pili, mediating adhesion, twitching motility, biofilm, and DNA transfer.

Pilus assembly protein FilE-like

Pilus assembly protein FilE-like (pilus_FilE, CDD cl40558) is a putative pilus system protein family found almost exclusively in Acinetobacter, assigned from genomic context, with a proline-rich repeat false-positive caveat.

Pilz (company)

Pilz GmbH & Co. KG is a German family-owned maker of safe automation technology, founded in 1948 and known for the PNOZ, the first emergency stop relay.

PilZ domain

PilZ domain: an approximately 110-amino-acid bacterial c-di-GMP receptor domain (Pfam PF07238), a six-stranded antiparallel beta-barrel binding cyclic di-GMP via RXXXR and [D/N]hSXXG motifs; only type I PilZ domains bind the ligand.

Sep 19, 2026

Pim de Witte

Pim de Witte is a Dutch entrepreneur from Nijmegen who co-founded and led Medal.tv from 2017 to 2025, then spun out the AI company General Intuition.

Pim Fortuyn

Pim Fortuyn (1948-2002), Dutch sociologist, columnist, and right-wing populist politician; founded the Lijst Pim Fortuyn in 2002, was assassinated nine days before the election, and his party won 26 seats.

Sep 21, 2026

Pim J. de Feyter

Pim J. de Feyter is a Dutch cardiologist and emeritus professor at Erasmus MC, Rotterdam, known for emergency angioplasty in unstable angina and for advancing coronary CT angiography.

Sep 19, 2026

Pim weight

The pim (Hebrew פים) was a Judahite weight equal to two-thirds of a shekel, about 7.8 grams, known from inscribed stone weights and 1 Samuel 13:21.

PIM1

PIM1 (Pim-1 proto-oncogene, HGNC:8986, 6p21.2) encodes a serine/threonine kinase of the PIM family, discovered in 1984 as a retroviral insertion site in mouse lymphomas; JAK/STAT-regulated, overexpressed in hematologic malignancies and prostate cancer, with no approved inhibitor.