All articles starting with S
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Sign o' the Times
Sign o' the Times (Sign "☮" The Times) is Prince's ninth studio album, a 16-track double album released March 31, 1987 on Paisley Park/Warner Bros., assembled from the abandoned Dream Factory, Camille, and Crystal Ball projects, topping the Pazz & Jop critics' poll.
Sign of Tanit
The sign of Tanit is the schematic emblem of Phoenician and Punic religion, a circle over a bar over a triangle, best known from Carthage tophet stelae.
Sign of the cross
The sign of the cross, also called signum crucis, is a Christian ritual gesture tracing a cross on the forehead, breast, and shoulders, documented by about 200.
Sign of the horns
Sign of the horns (mano cornuta, corna): hand gesture with index and little fingers extended. Meanings: rock/metal salute popularized by Ronnie James Dio, evil-eye ward, cuckold insult in the Mediterranean, and Texas's Hook 'em Horns (1955).
Sign of the Times (Harry Styles song)
Sign of the Times is Harry Styles's debut solo single, released April 7, 2017 on Columbia; a 5:42 piano rock ballad produced by Jeff Bhasker that hit number 1 in the UK and was revived by Project Hail Mary.
Sign stealing
Sign stealing: decoding an opposing baseball team's signals, chiefly catcher-to-pitcher pitch signs. Legal by naked eye from the field (runner on second), illegal with electronic devices; the 2017 Houston Astros scandal and PitchCom followed.
Sign test
The sign test is a nonparametric statistical test presented by Dixon and Mood in 1946, testing paired differences or a single sample's median using only the signs of the differences.
Sign-on and sign-off
Sign-on and sign-off are the ceremonial broadcast-day opening and closing sequences of radio and TV stations, including test tones, idents, national anthems and closedowns, largely replaced by 24-hour broadcasting but retained as morning formalities.
Signa Holding
Signa Holding is an Innsbruck-based Austrian real estate and retail holding company founded by René Benko, whose 2023 collapse became the largest insolvency in Austrian history.
Signage
Signage: physical signs, symbols, and graphics conveying direction, location, safety, or action in built spaces. Also called sign systems; distinct from wayfinding (a tool within it) and environmental graphic design. Covers signboard history from 1866, ADA tactile and ISO standards, and retail impact data.
Signal
A signal, also called an electrical signal, is a physical quantity conveying information, typically a voltage or current representing another quantity such as sound or temperature.
Signal (IPC)
A signal, known as a Unix or POSIX signal, is a software interrupt notifying a process of an asynchronous event, an IPC mechanism in UNIX-like systems.
Signal (software)
Signal, also known as Signal Private Messenger, is an encrypted messaging app run by the US nonprofit Signal Technology Foundation, founded in 2018 by Moxie Marlinspike and Brian Acton.
Signal (시그널) (South Korean TV series)
Signal (시그널) is a 2016 South Korean fantasy police procedural drama on tvN, starring Lee Je-hoon, Kim Hye-soo, and Cho Jin-woong as detectives linked by a walkie-talkie across time.
Signal AI
Signal AI (Signal Media Ltd.) is a London-based artificial intelligence company founded in 2013 by CEO David Benigson that sells AI-driven reputation and risk intelligence to large enterprises.
Signal amplification
Signal amplification: biological process where small molecular signals produce large responses, and the Reactome pathway R-HSA-392518 in which platelet ADP, ATP, and thromboxane A2 recruit further platelets after vascular injury.
Signal amplification by reversible exchange
Signal amplification by reversible exchange (SABRE) is a nuclear spin hyperpolarization technique that uses parahydrogen to greatly enhance NMR and MRI signals without chemically modifying the substrate.
Signal attenuation
Signal attenuation (Reactome R-HSA-74749) is the insulin receptor signaling shutdown step: endosomal protein tyrosine phosphatases dephosphorylate INSR, IRS1, IRS2, and SHC1, collapsing signaling complexes; endocytosis and receptor degradation attenuate signaling generally.
Signal averaging
Signal averaging is a signal processing technique that averages repeated measurements of a time-locked response so uncorrelated noise cancels, improving the signal-to-noise ratio in EEG, ECG, and spectroscopy.
Signal conditioning
Signal conditioning is the set of electronic techniques that convert a raw sensor output into an amplified, filtered, isolated, and linearized signal suited to measurement, processing, or digitization.
Signal crayfish
Signal crayfish (Pacifastacus leniusculus), a large North American freshwater crayfish native to the Pacific Northwest, introduced across Europe and Japan, carrier of lethal crayfish plague and a major invasive species.
Signal for Help
Signal for Help: a silent one-handed gesture (open palm, tucked thumb, fingers folded over) created by the Canadian Women's Foundation in April 2020 during COVID-19 lockdowns, letting people in danger discreetly ask someone to check in safely; viral on TikTok, used in several rescues, with known recognition limits.
Signal Foundation
The Signal Foundation, formally the Signal Technology Foundation, is an American nonprofit founded in 2018 by Brian Acton and Moxie Marlinspike to support the Signal messaging app.
Signal generator
A signal generator, also known as a frequency generator or test oscillator, is electronic test equipment producing signals with controllable frequency, amplitude, and modulation for testing devices.
Signal modulation
Signal modulation is the variation of a carrier wave's amplitude, frequency, or phase so that it carries information, underlying AM and FM radio, broadcasting, and digital schemes like QAM.
Signal Peak (coal mine)
Signal Peak, formally Bull Mountains Mine No. 1, is Montana's only underground coal mine, located in the Bull Mountains near Roundup and exporting most of its coal to Asia.
Signal peptidase complex subunit 3
SPCS3 (SPC22/23, SPC3) is an essential non-catalytic subunit of the ER signal peptidase complex, a 180-aa glycoprotein at human 4q34.2 required for signal peptide cleavage and linked to HIV-1 and chikungunya virus restriction.
Signal peptidase complex-like protein DTM1
Signal peptidase complex-like protein DTM1 (DEFECTIVE TAPETUM AND MEIOCYTES 1, LOC_Os07g43010) is a 112-aa rice ER membrane protein of the SPCS1 family, present only in cereals, required for early tapetum development and meiosis; disruption causes male sterility.
Signal peptide
Signal peptide: N-terminal peptide directing protein secretion via SRP, Sec, or Tat pathways; tripartite N-H-C structure, 15-30 residues, cleaved by signal peptidase; Tat type carries twin-arginine motif.
Signal phase and timing (SPaT)
Signal phase and timing (SPaT) is a message type in the SAE J2735 V2X standard that broadcasts a traffic signal's current and upcoming states to connected vehicles.