Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- VBraille(also: V-Braille, Vibration Braille)
- A method for representing Braille characters on a smartphone touchscreen using vibration feedback. The screen is divided into a 3-row by 2-column grid matching a standard Braille cell layout, and the phone vibrates when the user touches regions corresponding to raised dots in…
- View Hierarchy(also: UI Hierarchy, Accessibility Hierarchy, DOM Tree)
- The tree-structured representation of how user interface elements are organized and nested within an application. The view hierarchy defines parent-child relationships between UI components, specifying which elements are contained within others and how they are grouped. This…
- Visual Assistance Technology(also: VAT, Visual Aid App)
- Mobile applications and devices that take videos or images as input and provide verbal, haptic, or other non-visual output to help blind and low vision people access visual information. VAT can be human-enabled (e.g., Be My Eyes, Aira) where remote sighted volunteers or agents…
- Voice User Interface(also: VUI, Voice Command Interface, Voice Interface)
- An interface that allows users to interact with a device or application through spoken language commands rather than touch, mouse, or keyboard input. Voice user interfaces use automated speech recognition (ASR) to convert speech to text and natural language understanding (NLU)…
- Voicemail(also: Voice Mail, Voice Messaging)
- Voicemail is a telecommunications service that records an audio message from a caller when the called party is unavailable, for later retrieval by the recipient. Accessibility considerations include: reliance on hearing to listen to messages (a barrier for Deaf and…
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