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Technology and the built world

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GSM 03.38

GSM 03.38, published today as 3GPP TS 23.038, is the specification defining SMS character encodings; its 7-bit alphabet lets a 140-byte message carry 160 characters.

GSM frequency bands

GSM frequency bands: paired FDD allocations (P/E/R-GSM 900, DCS 1800, GSM 850, PCS 1900, GSM 750/480) with 200 kHz carrier spacing, ARFCN numbering, duplex spacings of 45/95/30 MHz, and EU/CEPT regulatory history.

GSM services

GSM services are the telecommunication services a GSM mobile network offers its subscribers: voice calls, SMS, data, supplementary services such as call forwarding, and international roaming.

GSM-R

GSM-R (GSM-Railway) is a railway digital radio communication system based on the GSM standard, used for driver and traffic control communication, emergency calls, and train control data.

GSM8K

GSM8K (Grade School Math 8K) is a benchmark of roughly 8,500 grade-school math word problems released by OpenAI in 2021, which became the standard test for chain-of-thought reasoning before saturating in the mid-2020s.

GSM8K verifier-based RL (verifier engineering)

Verifier-based selection and reinforcement learning for GSM8K is a family of methods from OpenAI's Cobbe and colleagues, introduced in 2021 to grade candidate math solutions.

GSMA

The GSMA (GSM Association) is a global trade organization for mobile operators, founded in 1987, headquartered in London, and organizer of the Mobile World Congress.

gsplat

gsplat is an open-source library for training Gaussian Splatting methods, created by the Nerfstudio team and offering faster, more memory-efficient rasterization than the original 2023 implementation.

GSPO

GSPO, or Group Sequence Policy Optimization, is a reinforcement learning objective for large language models introduced by Alibaba's Qwen team in July 2025 as a more stable alternative to GRPO.

Gstaad Palace

Gstaad Palace is a five-star superior grand hotel on the Oberbort hill above Gstaad in the Swiss Alps, opened in 1913 and owned by the Scherz family since 1938.

GT Academy

GT Academy (2008–2016) was a Nissan, PlayStation and Polyphony Digital virtual-to-reality competition turning Gran Turismo players into professional racing drivers; 22–23 graduates included Lucas Ordóñez and Jann Mardenborough.

GTE

GTE, formerly General Telephone & Electronics, was the largest independent non-Bell telephone company in the United States, founded in 1918 and merged into Bell Atlantic in 2000 to form Verizon.

GTE (Alibaba text embeddings)

GTE (General Text Embeddings) is a family of open, Apache-2.0-licensed text-embedding models from Alibaba's Tongyi Lab, first released in August 2023 and used for retrieval, reranking, and RAG.

GTK

GTK, formerly GTK+ (the GIMP Toolkit), is a free, open-source cross-platform widget toolkit for building graphical user interfaces, written in C. It underlies the GNOME desktop and the GIMP image editor.

GTL base oil

GTL base oil is a synthetic paraffinic lubricant base oil made from natural gas rather than crude oil, commercialized by Shell and classified as API Group III.

GTRE GTX-35VS Kaveri (कावेरी)

The GTRE GTX-35VS Kaveri (कावेरी) is an afterburning low-bypass turbofan developed by India's GTRE laboratory of DRDO. Intended for the Tejas fighter, it fell short on thrust and weight.

GTS Rail Operations

GTS Rail Operations Limited is a British rail company operating the Elizabeth line in London since May 2025, owned by the Go-Ahead Group, Tokyo Metro, and Sumitomo Corporation.

GTSAM

GTSAM, short for Georgia Tech Smoothing and Mapping, is a BSD-licensed C++ library for factor-graph inference, developed by Frank Dellaert's group at Georgia Tech for robot sensor fusion.

GTT Communications

GTT Communications is a multinational telecommunications and internet service provider headquartered in Tysons, Virginia. It operates the Tier 1 IP backbone AS3257 and emerged from chapter 11 as a private company in December 2022.

GuacaMol

GuacaMol is an open-source benchmark suite for evaluating generative models in de novo molecular design, proposed by BenevolentAI researchers and published in the Journal of Chemical Information and Modeling in 2019.

Guadalajara Convention

The Guadalajara Convention is a 1961 international treaty extending the Warsaw Convention's air carrier liability rules to carriers performing carriage they did not contract for.

Guadalajara Gas Pipeline

The Guadalajara Gas Pipeline is the name for two natural gas transmission systems serving Guadalajara, Jalisco, Mexico: the Manzanillo–Guadalajara line completed in 2011 and the Villa de Reyes–Aguascalientes–Guadalajara line in service since 2020.

Guadalajara International Airport

Guadalajara International Airport, officially Miguel Hidalgo y Costilla International Airport, serves Guadalajara, Jalisco, Mexico. It handled 18.7 million passengers in 2025, the third busiest in Mexico.

Guadalupe 4 hydroelectric plant

Guadalupe 4 (Central Hidroeléctrica Guadalupe IV) is a 216 MW hydroelectric plant on the Guadalupe River in Antioquia, Colombia, owned by EPM and in commercial operation since 1985, averaging 1,205 GWh a year.

Guafita Oil Field

The Guafita Oil Field is an onshore oil field in the Apure-Barinas basin of southwestern Venezuela, near the Colombian border in Apure state, discovered by the Guafita-1X well in 1984.

Guan dao

The guan dao (關刀), also called yanyuedao, is a Chinese polearm with a long shaft and large single-edged blade, popularly attributed to the Three Kingdoms general Guan Yu.

Guanabara Bay FSRU

The Guanabara Bay FSRU is a floating storage and regasification unit in Guanabara Bay, Rio de Janeiro, Brazil, owned and operated by Petrobras since 2009.

Guandao (关刀)

The guandao (關刀), also called yanyuedao, is a Chinese polearm with a heavy curved blade on a long haft, named after the general Guan Yu.

Guandi hydroelectric plant

The Guandi hydroelectric plant is a 2,400-megawatt hydropower station on the Yalong River in Liangshan, Sichuan, China, with a 168-meter concrete gravity dam, completed in 2013.

Guang Dong Natural Gas Grid

The Guangdong natural gas grid (广东省天然气管网) is the provincial trunk pipeline network serving all 21 cities of Guangdong, China, founded in 2008 and merged into PipeChina in 2020.