Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 235 of 333
- QuickFire (Quick Phrases, Quick Response Buttons)
- Pre-programmed short phrases or responses stored on AAC devices that can be accessed and played quickly with minimal navigation, typically arranged on a single page for rapid access. QuickFire phrases…
- Quorum (Quorum Programming Language)
- An evidence-based programming language designed with accessibility as a core principle, making it usable by people with and without visual impairments. Quorum provides audio input and output, screen r…
- R (R Programming Language, R Project, R Statistical Computing)
- A free, open-source programming language and software environment widely used for statistical computing, data analysis, and graphical representation. R is the standard tool for statisticians in both a…
- RACI Matrix (RACI chart, Responsibility Assignment Matrix)
- A project-management tool that maps tasks to stakeholders using four roles: Responsible (does the work), Accountable (owns the outcome), Consulted (provides input), and Informed (kept in the loop). Ac…
- RAG (Retrieval-Augmented Generation)
- An AI architecture pattern that pairs a large language model with an external knowledge store (typically a vector index of text chunks) so that, for each user query, relevant documents are retrieved f…
- RANSAC (Random Sample Consensus)
- An iterative algorithm (Fischler and Bolles, 1981) for fitting a mathematical model to data that contains a significant proportion of outliers. In accessibility-focused indoor navigation systems, RANS…
- RAVEN (Rule-based Accessibility Validation Environment)
- An accessibility testing tool developed by IBM as a set of Eclipse IDE plug-ins for verifying the accessibility of graphical user interface applications. RAVEN uses aspect-oriented programming techniq…
- RDF (Resource Description Framework)
- A W3C standard for describing resources on the web using a graph-based data model of subject-predicate-object triples. RDF provides a foundation for the Semantic Web by enabling machine-readable metad…
- REAPER (Rapid Environment for Audio Production, Engineering, and Recording)
- A digital audio workstation (DAW) software application developed by Cockos that is known for its relatively strong accessibility support compared to other professional DAWs. When used with the OSARA (…
- RESOLV Icons (Representational Enumerated Semi-transparent Overlaid Labels for Voice)
- A visual disambiguation technique for voice interfaces where semi-transparent numbered labels are overlaid on screen elements that match an ambiguous voice command. When a user speaks a command that c…
- RFID (Radio Frequency Identification, RFID Tag)
- A technology that uses electromagnetic fields to automatically identify and track tags attached to objects. RFID tags contain electronically stored information that can be read by RFID readers without…
- RGB-Depth Camera (RGB-D camera, Depth camera)
- A camera that captures both a conventional colour image (RGB) and a per-pixel depth map, usually via structured light, time-of-flight, or stereo sensing. RGB-D cameras are widely used in assistive nav…
- RGBD Camera (RGB-D Camera, Depth Camera, Stereo Camera)
- A camera that captures both a colour (RGB) image and a per-pixel depth (D) measurement of the scene, yielding a 3D representation of the environment. Depth can be produced by stereo vision, structured…
- RNIB (Royal National Institute of Blind People, Royal National Institute for the Blind)
- The largest charity supporting blind and partially sighted people in the United Kingdom, providing services including accessible format transcription, assistive technology advice, employment support, …
- RSSI (Received Signal Strength Indicator, Received Signal Strength Index)
- A measurement of the power level of a radio signal received by a device, commonly used in Bluetooth and Wi-Fi based indoor positioning systems. In accessible indoor navigation, RSSI readings from BLE …
- RSSI Fingerprinting (Received Signal Strength Fingerprinting, Radio Fingerprinting, Signal Fingerprinting)
- An indoor localization technique in which a device estimates its position by comparing the current pattern of received signal strengths (RSSI) from surrounding radio sources — most commonly Bluetooth …
- Radial Direction (Angular Direction, Heading, Bearing (audio display))
- In auditory-display research, a data value that represents a direction in a plane — for example a compass bearing, the tangent of a curve, or the orientation of a pointer — treated as an angle rather …
- Raised Line Drawing (Raised Line Graphic, Tactile Line Drawing, Swell Paper Drawing)
- A graphic representation in which lines and shapes are physically raised above the surface of paper or another substrate so they can be perceived by touch. Raised line drawings are a fundamental tool …
- Raised-Line Drawing (Raised-Line Picture, Tactile Line Drawing, Embossed Line Drawing)
- A raised-line drawing is a tactile representation of a visual image created by producing elevated lines on a surface that can be felt by touch, enabling blind and visually impaired people to perceive …
- Random Forest Classifier (Random Forest)
- A machine learning algorithm that creates multiple decision trees during training and outputs the class that is the mode of the individual trees predictions. Random forests are widely used in gesture …