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Sierras Blancas Oil and Gas Field
Sierras Blancas is a shale oil and gas field in the Vaca Muerta formation of the Neuquén Basin, western Argentina, operated by Shell, which moved it into development in 2018.
Sifflet
Sifflet is a Paris-based data observability SaaS platform founded in 2021 by Salma Bakouk and the Fathallah brothers, offering data quality monitoring, lineage, catalog, and AI agents; backed by EQT Ventures and Mangrove.
SIG (robot)
SIG, pronounced "shigu," was a humanoid robot developed in Japan around 2000 by the Kitano Symbiotic Systems Project, known for its active audition system that integrated hearing, vision, and movement.
Sig Hansen
Sig Hansen, full name Sigurd Jonny Hansen, is an American fishing captain of the crab vessel F/V Northwestern and a lead captain on Deadliest Catch since 2005.
SIG MCX
The SIG MCX, or SIG Sauer MCX, is a family of modular short-stroke gas-piston rifles and pistols made by SIG Sauer in New Hampshire, first released in 2015.
SIG MCX Spear
The SIG MCX Spear is a modular gas-piston rifle made by SIG Sauer, developed for the U.S. Army's NGSW program and adopted as the XM7 rifle, now the M7.
SIG MPX
The SIG MPX, also known as the SIG-Sauer MPX, is a family of gas-piston 9mm submachine guns and carbines made by SIG Sauer, introduced at SHOT Show in 2013.
SIG Sauer
SIG Sauer, formerly SIGARMS, is an American firearms manufacturer headquartered in Newington, New Hampshire, known for its P-series pistols and the P320-based M17 and M18 sidearms of the United States military.
SIG Sauer M17
The SIG Sauer M17 is a 9 mm striker-fired pistol adopted by the US Army in 2017 as its Modular Handgun System, replacing the Beretta M9 service pistol.
SIG Sauer P220
The SIG Sauer P220 is a semi-automatic pistol developed by SIG with J.P. Sauer & Sohn, adopted by the Swiss Army in 1975 as the Pistole 75.
SIG Sauer P226
The SIG Sauer P226 is a full-size, double-action semi-automatic pistol developed by SIG and J.P. Sauer & Sohn, built for the 1984 U.S. Army XM9 trials.
SIG Sauer P228
The SIG Sauer P228 is a compact 9mm semiautomatic pistol developed from the full-size P226 and adopted by the US military as the M11 pistol.
SIG Sauer P250
The SIG Sauer P250 is a hammer-fired, double-action-only semi-automatic pistol introduced in 2007, built around a serialized fire control unit that swaps between interchangeable grip modules and calibers; it was the direct predecessor of the P320.
SIG Sauer P320
The SIG Sauer P320 is a modular, striker-fired semi-automatic pistol introduced by SIG Sauer in 2014 and adopted by the US military as the M17 and M18.
SIG Sauer P365
The SIG Sauer P365 is a striker-fired 9 mm pistol introduced in 2018 for concealed carry, notable for holding 10 rounds in a gun about 1 inch wide.
SIG Sauer SIG516
The SIG Sauer SIG516 is a family of AR-15/M16-pattern rifles and carbines that replace direct impingement with a short-stroke gas piston, chambered in 5.56x45mm NATO and introduced at the SHOT Show in January 2010.
SIG SG 510
The SIG SG 510, known in Switzerland as the Sturmgewehr 57 or Stgw 57 (Fass 57), is a selective-fire battle rifle adopted by the Swiss Army in 1957.
SIG SG 550
The SIG SG 550, known in Switzerland as the Stgw 90 or Fass 90, is a 5.56 mm Swiss assault rifle that entered army service in 1990.
SIGCOMM
SIGCOMM, or ACM SIGCOMM, is the ACM's Special Interest Group on Data Communication, founded in 1969, whose annual conference is one of the leading publication venues for computer networking research.
SIGCSE Technical Symposium
The SIGCSE Technical Symposium (SIGCSE TS) is the annual flagship conference of ACM SIGCSE, the Association for Computing Machinery's computer science education group, held in North America each year since 1970.
Sight distance
Sight distance is the length of roadway ahead visible to a driver, measured along the line of sight; a controlling criterion of highway design with four AASHTO types: stopping, intersection, passing, and decision.
SigLIP (sigmoid loss for language-image pretraining)
SigLIP is a method for training paired image-text models that replaces CLIP's softmax contrastive loss with a pairwise sigmoid loss, introduced at Google and published at ICCV 2023.
SIGMA 155
SIGMA 155, known in Israel as the Ro'em, is a fully automatic 155 mm self-propelled howitzer developed by Elbit Systems for the Israel Defense Forces, entering combat in 2026.
Sigma Computing
Sigma Computing is a San Francisco company founded in 2014 by Rob Woollen and Jason Frantz whose Sigma platform is a spreadsheet UI on cloud data warehouses like Snowflake and Databricks, compiling formulas into live SQL with writeback, AI apps, and embedding.
Sigma Plan
The Sigma Plan (Dutch: Sigmaplan) is a flood protection and nature restoration program of the Flemish government, launched in 1977 after the January 1976 storm surge floods along the tidal Scheldt in Belgium.
Sigma-delta ADC
The sigma-delta ADC (Σ-Δ ADC, also written delta-sigma ADC) is an analog-to-digital converter that oversamples with a coarse 1-bit quantizer in a feedback loop, achieving high resolution for precision, low-bandwidth measurement.
Sigmatek
Sigmatek (SIGMATEK GmbH & Co KG) is an Austrian manufacturer of complete automation systems for industrial machine and plant engineering, founded in 1988 and headquartered in Lamprechtshausen near Salzburg.
SIGMET
SIGMET, or Significant Meteorological Information, is an ICAO-standard aviation weather warning issued by a meteorological watch office for hazards such as volcanic ash and severe turbulence.
Sign language recognition
Sign language recognition (SLR) is the automatic identification of sign language content from video or sensor data by a computer, spanning more than 300 distinct sign languages.
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.