All articles starting with S

Symphony X

Symphony X is an American progressive metal band formed April 1994 in Middletown, New Jersey, by guitarist Michael Romeo after his The Dark Chapter demo. Known for neoclassical, power, and symphonic elements, albums The Divine Wings of Tragedy, The Odyssey, Paradise Lost, and Underworld, and vocalist Russell Allen.

Sep 19, 2026

SymphonyAI

SymphonyAI is a privately held enterprise AI software company founded by billionaire Romesh Wadhwani in 2017, building vertical AI applications for retail, defense, and financial services.

Symphoricarpos

Symphoricarpos (snowberry), Caprifoliaceae genus of about 15 deciduous shrub species native to North America and central-southern China, grown for white to purplish drupes; type S. orbiculatus, published by Duhamel 1755.

Symphoricarpos albus

Symphoricarpos albus (L.) S.F.Blake, the common snowberry, is a suckering deciduous shrub in the honeysuckle family, native across North America to Baja California, with pink flowers and waxy white berries lasting into winter.

Symphyla

Symphyla are small, creamy-white, eyeless arthropods that live in soil pores up to 50 cm deep. They feed on decaying matter and seeds, and some species are agricultural pests.

Symphylan ecology and behavior

Symphylans (class Symphyla, garden centipedes) are small blind white myriapod soil arthropods, about 200 species in Scutigerellidae and Scolopendrellidae, moving through soil pores, feeding omnivorously, and including the crop pest Scutigerella immaculata.

Symphylan fossil record and evolution

The symphylan fossil record is exceptionally poor, known almost entirely from amber, with the oldest fossil, Symphylella patrickmuelleri, from Burmese amber about 99 million years ago.

Symphylan reproduction and development

Symphylan reproduction and development: males never copulate but leave silk-stalked spermatophores that females store in mouth pouches, while young hatch with fewer legs and moult into adults.

Symphylan taxonomy and families

Symphylan taxonomy rests on two families, Scutigerellidae and Scolopendrellidae, covering about 200 described species of small white soil arthropods, but cladistic analysis finds Scolopendrellidae paraphyletic.

Symphylans and pauropods

Symphylans and pauropods are two of the four classes of myriapods, small translucent eyeless soil animals; the garden symphylan Scutigerella immaculata is a crop pest.

Symphylans as agricultural pests

Garden symphylan (Scutigerella immaculata), also called garden centipede, a white soil myriapod pest of over 100 crops; root-feeding causes stunting, managed by tillage, bait trapping, cultural controls, and preplant insecticides or fumigation.

Symphysiotomy

Symphysiotomy: surgical partial division of the pubic symphysis to widen the pelvis during obstructed childbirth, an alternative to caesarean section; proposed by Sigault in 1768, now rarely performed, with controversy over complications and its non-consensual use in Ireland 1944-1984.

Symphysis pubis dysfunction

Symphysis pubis dysfunction (SPD), now called pregnancy-related pelvic girdle pain (PGP), is painful instability of the pubic symphysis and sacroiliac joints in pregnancy, affecting about 1 in 5 pregnant women and treated with physiotherapy, belts, and exercise.

Oct 20, 2026

Symphytum

Symphytum (comfrey), Boraginaceae genus of about 34-40 perennial herbs native to Europe and W. Asia; knitbone topical remedy for sprains and bruises, but contains hepatotoxic pyrrolizidine alkaloids limiting use.

Symple

Symple (Freeling & Rosenau, 2010) is a two-player abstract territory board game using the plant-or-grow protocol: plant one stone or grow every chain, scoring stones minus P per chain. Variants include Sygo and Symple Hex.

Symplectic field theory

Symplectic field theory, introduced by Yakov Eliashberg, Alexander Givental, and Helmut Hofer in 2000, counts punctured pseudoholomorphic curves to produce algebraic invariants of contact manifolds and their Legendrian submanifolds.

Symplectic form

A symplectic form is a closed, nondegenerate differential 2-form on a smooth manifold, necessarily even-dimensional, that underlies symplectic geometry and provides the mathematical framework for Hamiltonian mechanics.

Symplectic group

The symplectic group is the classical group of matrices A satisfying AᵗJA = J, named by Hermann Weyl in 1939 and central to symplectic geometry and Hamiltonian mechanics.

Symplectic integrator

A symplectic integrator, also called a symplectic algorithm, is a numerical method for Hamiltonian systems whose steps preserve phase-space structure, making it standard for long-term planetary orbit integrations.

Symplectic Lie algebra

The symplectic Lie algebra sp(2n, k) is the Lie algebra of endomorphisms of a 2n-dimensional space preserving a symplectic form, with dimension n(2n+1) and applications in Hamiltonian mechanics.

Symplectic manifold

A symplectic manifold is an even-dimensional differentiable manifold equipped with a closed, nondegenerate 2-form called a symplectic form, and it is the natural geometric setting for Hamiltonian mechanics.

Sep 29, 2026

Symplectic reduction

Symplectic reduction is a construction in symplectic geometry and Hamiltonian mechanics that quotients a symplectic manifold by a symmetry group, producing a lower-dimensional reduced space.

Oct 20, 2026

Symplocaceae

Symplocaceae (sweetleaf family), Ericales, two genera Cordyloblaste and Symplocos, c. 300–320 woody species disjunct between eastern Asia and the Americas; Eurasian origin c. 52 Ma, revised 2008 classification.

Symplocarpus foetidus

Symplocarpus foetidus, eastern skunk cabbage, is a perennial Araceae wetland plant of eastern North America that thermoregulates its spadix near 20 °C by cyanide-resistant respiration, blooming through snow in early spring.

Symplocos

Symplocos (sweetleaf) is a genus of about 300-411 accepted species of trees and shrubs in Symplocaceae, Ericales, native from Asia to the Pacific and the Americas, absent from Africa; leaves dry yellow from aluminium accumulation, fruits often blue.

Symposium

The Greek symposium (symposion, "drinking together") was an aristocratic male drinking party held in an andron, with wine mixed with water in a krater, reclining guests, poetry, and games, documented by Plato, Xenophon, and vase paintings.

Symposium (Συμπόσιον) (Plato)

Plato's Symposium (Συμπόσιον), a middle-period dialogue of about 385–380 BCE, stages speeches in praise of love at Agathon's dinner party, culminating in Diotima's account of Eros and Alcibiades' praise of Socrates.

Oct 22, 2026

Symposium literature

Symposium literature is the body of ancient Greek and Roman writing connected with the symposium, the ritualized aristocratic drinking party, spanning sympotic poetry, prose dialogues, and later table talk.