Technology and the built world

Key Technology (company)

Key Technology, Inc. is an American company in Walla Walla, Washington, that makes digital sorting, inspection, conveying, and processing equipment for food processors and other industries.

Key usage

Key usage is an X.509 v3 certificate extension defined in RFC 5280 that restricts a public key to permitted operations such as digital signatures, encryption, or certificate signing.

Key West International Airport

Key West International Airport, also called Key West Airport, is a Monroe County-owned airport in Key West, Florida, serving the Florida Keys; it handled about 1.4 million passengers in 2024.

Key-agreement protocol

A key-agreement protocol is a cryptographic protocol by which parties exchange messages over a public channel to establish a shared secret key, proposed by Diffie and Hellman in 1976.

Keyboard layout

A keyboard layout, also called a keymap, is the assignment of characters and functions to keyboard keys, best known as QWERTY, which dates to the 1874 Remington typewriter.

Keyboard shortcut

A keyboard shortcut, or hotkey, is a key or combination of keys that performs a command normally done with a mouse, such as copying text.

Keyboard technology

Keyboard technology covers how computer keyboards convert a keypress into a character, from switch types and layouts to USB HID reports, rollover limits, and latency.

Keychain

A keychain, also called a keyring, is a small device, usually a metal split ring, that holds keys together and attaches them to a pocket, bag, or belt.

Keychain, also called Apple Keychain, is the encrypted credential-storage system built into Apple's operating systems, storing passwords, cryptographic keys, and certificates, with iCloud Keychain syncing them across devices.

Keyera

Keyera Corp. is a Canadian midstream energy company based in Calgary, Alberta, that gathers and processes natural gas and operates NGL infrastructure around Edmonton and Fort Saskatchewan.

Keygen

Keygen was an HTML form element, invented by Netscape, that generated a public/private key pair on form submission; it has been removed from all major browsers.

Oct 22, 2026

Keyhole porosity dynamics in laser powder bed fusion

Keyhole porosity is a void defect in laser powder bed fusion metal printing, formed when the laser's vapor cavity collapses and traps bubbles that degrade fatigue life.

Keying (signal modulation)

Keying is a digital modulation method that switches a carrier signal's amplitude, frequency, or phase between discrete states to encode digital data, yielding ASK, FSK, and PSK.

Keynote (presentation software)

Keynote, also known as Apple Keynote, is Apple's presentation software for Mac, iPhone, iPad, and web browsers, unveiled in 2003 as a rival to Microsoft PowerPoint.

Keyouzhong power station

Keyouzhong power station, also known as Xing'an Meng Youzhong power station, is a 1,320 MW coal-fired power station in Hinggan League, Inner Mongolia, China, operating since 2022.

Keyphrase extraction

Keyphrase extraction is a natural language processing method that identifies the small set of phrases best describing a document, returning a ranked list drawn from the text.

Keypoint detection

Keypoint detection is a computer vision method that identifies distinctive points of interest, such as corners, in an image so the same locations can be found again in other images.

Keypunch

A keypunch is a keyboard-operated machine that punches data onto cards for tabulating machines and early computers, standard from the early 1900s to the 1970s.

Keysight

Keysight Technologies is an American electronic design, emulation, and test company headquartered in Santa Rosa, California. It was spun off from Agilent Technologies in 2014, inheriting the measurement business of Hewlett-Packard.

Keystone (architecture)

A keystone is the central wedge-shaped stone at the crown of an arch or vault, set in place last so it locks the surrounding stones into a self-supporting ring.

Keystone Generating Station

Keystone Generating Station is a 1,711 MW coal-fired power plant in Shelocta, Pennsylvania, whose two bituminous coal units were commissioned in 1967 and 1968 and sell power into the PJM market.

Keystone Pipeline

The Keystone Pipeline, also known as the Keystone Pipeline System, carries crude oil from Hardisty, Alberta, to U.S. refineries; its proposed Keystone XL expansion was canceled in 2021.

Keystone XL

Keystone XL was a proposed Keystone Pipeline extension carrying oil sands crude from Hardisty, Alberta, to Steele City, Nebraska, canceled in 2021 after President Biden revoked its permit.

Keystroke dynamics

Keystroke dynamics is a behavioral biometric method that authenticates people from typing timing patterns like dwell and flight times, using only an existing keyboard or touchscreen.

Keystroke logging

Keystroke logging, also known as keylogging, records keys pressed on a keyboard, using software or hardware devices to capture passwords and bypass other security measures.

Keytar

The keytar, also known as the keyboard guitar, is a keyboard instrument held like a guitar and strapped over the shoulder for mobile stage playing.

Keyword extraction

Keyword extraction is a natural language processing method that automatically identifies the most representative words or phrases in a document, used for indexing, summarization, and information retrieval.

Keyword spotting

Keyword spotting is a speech processing method that detects specific spoken words or phrases in an audio stream, outputting a confidence score rather than a transcription.

KFin Technologies

KFin Technologies, also known as KFintech, is an Indian registrar and transfer agent and fund administrator serving mutual funds and corporate issuers in India and abroad.