Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 309 of 333
- VPAT (Voluntary Product Accessibility Template, Accessibility Conformance Report, ACR)
- A standardized document in which vendors report how well their product or service conforms to accessibility standards such as WCAG, Section 508, and EN 301 549. Originally created by the Information T…
- VQA (Visual Question Answering)
- VQA (Visual Question Answering) is an AI task in which a system answers natural-language questions about the content of an image. In assistive contexts, VQA systems such as Be My AI, Seeing AI, and Ai…
- VR Accessibility Training (Virtual Reality Training for Accessibility, VR-Based AT Training)
- The use of virtual reality environments to teach people with disabilities how to use assistive technologies or navigate unfamiliar real-world scenarios in a safe, controlled setting. VR training allow…
- VR Controllers (Virtual Reality Controllers, Motion Controllers)
- Handheld input devices used to interact with virtual reality environments, typically requiring users to grip, hold, and manipulate buttons, triggers, and joysticks. Standard VR controllers present sig…
- VR Gaming Accessibility
- The practice of making virtual reality games playable and enjoyable by people with disabilities. VR gaming presents unique accessibility challenges beyond traditional game accessibility because of its…
- VR-ASL (Virtual Reality American Sign Language)
- A simplified adaptation of American Sign Language (ASL) designed for use in virtual reality environments where current controller tracking technology cannot capture the full range of hand and finger m…
- VRChat
- VRChat is a mainstream, user-generated social virtual reality platform where people gather as avatars in user-created 'worlds' that range from quiet scenic environments to busy public social hubs. Use…
- VRML (Virtual Reality Modeling Language)
- A file format and markup language for describing interactive 3D objects and environments on the web, first standardized in 1995. VRML allowed users to view, rotate, and navigate 3D scenes in web brows…
- Valence (Emotional Valence, Hedonic Tone)
- In affective science, valence is the dimension of emotional experience that describes positivity versus negativity — whether a feeling is pleasant or unpleasant. Paired with arousal, valence forms the…
- Valence-Arousal Model (VA Model, Circumplex Model, Valence-Arousal Space)
- A two-dimensional model of affect, introduced by Russell (1980), that represents emotional states along two orthogonal axes: valence (pleasant versus unpleasant) and arousal (activated versus deactiva…
- Value Sensitive Design (VSD)
- A design methodology that accounts for human values in a principled and systematic way throughout the technology design process. Value Sensitive Design integrates three types of investigation: concept…
- Variable Ability (Fluctuating Ability, Dynamic Disability)
- The characteristic of many chronic illnesses and disabilities where a person's functional abilities change significantly over time — across days, hours, or even minutes. Variable ability includes both…
- Variable Font (OpenType Variable Font, Parametric Font)
- A font file that contains multiple design variations along one or more continuous axes — weight, width, slant, optical size, or custom axes — allowing any intermediate value to be rendered at run time…
- Variable Friction (Variable Friction Display, Friction Modulation)
- A surface haptics technique that dynamically adjusts the friction between a user's fingertip and a touchscreen surface to create the sensation of different textures. Typically achieved through ultraso…
- Variable Pointing Performance (Variable Pointing Ability, Intermittent Pointing Difficulty)
- A condition where a person's ability to accurately use a pointing device (such as a mouse, trackpad, or touchscreen) fluctuates over time due to factors like physical impairments, fatigue, medication …
- Variation Summary
- A concise presentation format for AI-generated image descriptions that explicitly organizes information into three categories: agreements (claims supported by all or most models), disagreements (claim…
- Variation Surfacing (Variation Display, Surfacing Variations)
- A technique for helping users assess AI reliability by generating multiple responses from one or more AI models and systematically presenting the differences, agreements, and unique mentions across th…
- Variation-Aware Description
- A presentation format for AI-generated image descriptions that aggregates multiple model responses into a single coherent, hierarchical description while highlighting variations inline. When multiple …
- Vascular Dementia (Multi-Infarct Dementia, Post-Stroke Dementia)
- A type of dementia caused by reduced blood flow to the brain, often resulting from stroke or small vessel disease. Vascular dementia is the second most common form of dementia and typically affects pr…
- Veering (Lateral Drift)
- The tendency of blind and visually impaired pedestrians to gradually drift away from a straight path while walking, resulting in a curved trajectory rather than a direct line. Veering is a well-docume…