All articles starting with P
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PS General Slocum
The PS General Slocum was a wooden sidewheel passenger steamboat, built in Brooklyn in 1891, that burned in the East River on June 15, 1904, killing 1,021 people.
PS Waverley
PS Waverley is a British paddle steamer built on the Clyde in 1946 for the London and North Eastern Railway, the last seagoing passenger-carrying paddle steamer in the world.
PS/2 port
The PS/2 port, named for IBM's Personal System/2 family, is a 6-pin mini-DIN connector for keyboards and mice, introduced in 1987 and still found on some motherboards into the 2020s.
PSA 10
PSA 10, formally PSA Gem Mint 10, is the highest grade on Professional Sports Authenticator's 10-point trading card scale, introduced in July 1991 for virtually perfect cards.
PSA Airlines
PSA Airlines is a wholly owned regional subsidiary of American Airlines Group operating American Eagle flights, founded in 1979 and headquartered in Charlotte, North Carolina, since 2026.
PSA EW/DW engine
The PSA EW/DW engine is a family of petrol (EW) and diesel (DW) engines powering Peugeot and Citroën models like the 307, 407, C4, and C5.
PSA Group
PSA Group, legally Peugeot S.A., was a French multinational automaker that owned Peugeot, Citroën, DS, Opel, and Vauxhall until merging with Fiat Chrysler to form Stellantis in 2021.
PSA International
PSA International is a Singapore-headquartered global container terminal operator descended from the Port of Singapore Authority; it handled 105 million TEUs in 2025 across 45 countries.
PSA PureTech engine
The PSA PureTech engine is a family of three-cylinder petrol engines from PSA Group, launched in 2012 and used across Peugeot, Citroën, DS, and Opel models.
PSA testing
PSA testing, also known as the PSA test, is a blood test measuring prostate-specific antigen to screen men for prostate cancer, though it carries risks of false positives and overdiagnosis.
PSA TU engine
The PSA TU engine is a family of small four-cylinder petrol engines developed by PSA Peugeot Citroën, launched in 1986 on the Citroën AX and displacing 954 to 1,587 cc.
Psalm 119
Psalm 119 (תהלים קיט) is the Bible's longest chapter, a 176-verse Hebrew alphabetic acrostic of 22 eight-verse stanzas, one per letter from aleph to tav, meditating on Torah through eight recurring synonyms.
Psalm 137
Psalm 137, opening "By the rivers of Babylon," is a biblical lament of the Babylonian exile, recited on Tisha B'Av and set by many composers.
Psalm 23
Psalm 23, also known as "The Lord is my shepherd," is a six-verse psalm in the Hebrew Bible's Book of Psalms, attributed to David, portraying God as shepherd and host.
Psalm 51
Psalm 51, also known as Miserere mei or Psalm 50 in the Vulgate, is the classic confession psalm of repentance, traditionally tied to David after Nathan rebuked him over Bathsheba.
Psalm 91
Psalm 91, also called the Soldier's Psalm, is a psalm of trust in the Book of Psalms promising protection from danger, long used on amulets and by soldiers in war.
Psalmodi
Psalmodi, a Benedictine abbey of Saints Peter and Paul in Eastern Languedoc, France, founded by Corbilla in 783, secularized in 1537, excavated by Williams College from 1970.
Psalmotoxin
Psalmotoxin 1 (PcTx1), a 40-amino-acid ICK peptide from the Trinidad chevron tarantula Psalmopoeus cambridgei, is the first specific ASIC1a blocker (IC50 ~1 nM), inhibiting the channel by shifting its pH-dependent desensitization to alkaline values.
Psalms
The Psalms (Hebrew Sefer Tehillim, Book of Praises) are 150 liturgical poems in the Hebrew Bible, arranged in five books and attributed largely to David.
Psalms of Asaph (אסף)
Psalms of Asaph (אסף), biblical Psalms 50 and 73–83 in the Masoretic Psalter, attributed to Asaph the Levite musician of David's court and his descendant guild; Elohistic, historically themed collection spanning preexilic to exilic scholarship.
Psammetichus (son of Theocles)
Psammetichus, son of Theocles, was a second-generation Greek soldier named in the mercenary graffiti carved at Abu Simbel during pharaoh Psammetichus II's Nubian campaign of 593/591 BC.
Psammodromus
Psammodromus, sand racers, a genus of six lacertid lizard species in southwest Europe and North Africa; with Gallotia it forms the subfamily Gallotiinae, sister to all other lacertids.
Psammomys
Psammomys (sand rats) is a gerbil genus with two species, fat sand rat P. obesus and thin sand rat P. vexillaris, desert herbivores of North Africa and the Middle East, famous as a polygenic diet-induced type 2 diabetes model and Leishmania reservoir.
Psammophis
Psammophis (sand snakes), type genus of Psammophiidae: 35 diurnal, rear-fanged African and Asian snake species; taxonomically complex, with Dromophis synonymized and the sibilans complex split.
Psammuthes
Psammuthes, Egyptian Pasherienmut and Greek Psammuthis, was a pharaoh of Egypt's 29th Dynasty who briefly held the kingship around 392/1 BC between Nepherites I and Hakor.
Psamtik I
Psamtik I, also known as Psammetichus I, was a pharaoh of ancient Egypt who reigned from 664 to 610 BC, expelled the Assyrians, and founded the Twenty-sixth Dynasty.
Psamtik II
Psamtik II (Psammetichus II, Psamtek II; throne name Neferibre) was a pharaoh of Egypt's 26th Dynasty, reigning from 595 to 589 BC and leading a major campaign against Nubia in 593 BC.
Psamtik III
Psamtik III, also called Psammetichus III, was the last pharaoh of Egypt's Twenty-sixth Dynasty, reigning 526 to 525 BC until Cambyses II of Persia conquered Egypt.
Psamtik IV
Psamtik IV, also Psammetichus IV or Psamtek IV, was a rebel king who ruled parts of Egypt during the revolt against Persian rule of 487-485 BC.
Psamtik-seneb
Psamtik-seneb, also known as Psammetichus-seneb, was governor of the Saite nome in the western Nile Delta during the reign of Psamtik I of Egypt's Twenty-sixth Dynasty.