Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 304 of 333
- UI Agent (User Interface Agent, Browser Agent, AI Agent)
- An AI-powered software system that can autonomously interact with graphical user interfaces on behalf of a user, performing tasks by interpreting natural language commands and translating them into in…
- UI Automation (UIA, Microsoft UI Automation, UIAutomation)
- Microsoft's accessibility framework introduced in Windows Vista as the successor to Microsoft Active Accessibility (MSAA). UI Automation provides programmatic access to user interface elements, enabli…
- UI Detection (User Interface Detection, GUI Element Detection)
- The use of computer vision and machine learning to automatically identify and classify user interface elements (buttons, text fields, icons, toggles, etc.) from screenshots or screen pixels. In access…
- UI Semantics (User Interface Semantics, Interface Semantics)
- The meaningful properties and roles of user interface elements that go beyond their visual appearance, including what an element does, how it can be interacted with, and its relationship to other elem…
- UN Convention on the Rights of Persons with Disabilities (UN CRPD, CRPD, Convention on the Rights of Persons with Disabilities)
- An international human rights treaty adopted by the United Nations in 2006 and entered into force in 2008, establishing the rights of people with disabilities to full participation in society. The CRP…
- UNCRPD (United Nations Convention on the Rights of Persons with Disabilities, CRPD)
- An international human rights treaty adopted by the United Nations General Assembly in 2006 that articulates the rights of people with disabilities across all areas of life, including employment, educ…
- USDZ (Universal Scene Description Zip)
- A 3D file format based on Pixar's Universal Scene Description (USD), packaged as a zip archive so a single file can carry meshes, textures, materials, and animations. USDZ is the default 3D asset form…
- UWEM (Unified Web Evaluation Methodology)
- The Unified Web Evaluation Methodology (UWEM) is a standardized European methodology for evaluating web accessibility conformance with WCAG. Developed through EU-funded projects including the European…
- Ubiquitous Accessibility (Accessibility Everywhere)
- A vision for accessibility in which individuals can invoke their needed assistive technologies or access features on any computing device they encounter, rather than being limited to personally owned …
- Ubiquitous Computing (Ubicomp, Pervasive Computing, Ambient Computing)
- Ubiquitous computing is a paradigm where computing is integrated seamlessly into everyday environments and objects, becoming an invisible part of daily life through sensors, smart devices, and network…
- Ultra-Wideband (UWB, Ultra wideband)
- A short-range radio-frequency technology that uses very wide frequency bands (typically above 500 MHz) and very short pulses to enable centimetre-accurate distance and angle-of-arrival measurements be…
- Ultrasonic Sensor (Ultrasound Sensor, Proximity Sensor)
- A device that measures distance to objects by emitting high-frequency sound waves and calculating the time it takes for the echo to return. In assistive technology, ultrasonic sensors are commonly use…
- Unaided AAC (Unaided Augmentative and Alternative Communication, Body-Based AAC)
- The branch of Augmentative and Alternative Communication that relies solely on the user's body — gestures, facial expressions, vocalisations, manual signs, body orientation — without an external devic…
- Uncanny valley
- A concept in robotics and animation describing the discomfort people feel when a humanoid figure looks almost, but not quite, realistic. As robots or avatars approach human likeness, they can provoke …
- Underdiagnosis (Missed Diagnosis)
- A pattern where a medical condition goes unrecognized and undiagnosed in a significant portion of the affected population. ADHD is substantially underdiagnosed in women, adults, and people of color du…
- Understandability (Understandable, Comprehensibility)
- The quality of information or interface elements being cognitively accessible — meaning a user can not only perceive the content but also internalise its meaning and know how to act on it. Understanda…
- Unicode (Unicode Standard, UTF-8)
- A universal character encoding standard that assigns a unique code point to every character in every writing system, enabling consistent representation and processing of text across all platforms, pro…
- Unidirectional Support (One-Way Support, Asymmetric Support)
- A pattern of assistance in which support flows in only one direction—from a helper to a recipient—without opportunities for feedback, mutual contribution, or reciprocal engagement. In disability conte…
- Unified English Braille (UEB)
- The standard braille code used for English-language literary materials in the United States, United Kingdom, Australia, Canada, and other English-speaking countries. UEB was adopted to replace multipl…
- Unified Parkinson's Disease Rating Scale (UPDRS, MDS-UPDRS)
- A standardized clinical assessment tool used to measure the severity and progression of Parkinson's Disease across multiple domains: mental, behavioral, and mood; activities of daily living; motor exa…