Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 206 of 333
- Olfactory Display (Olfactory Interface, Olfactory Feedback, Smell Display, Scent Display)
- An olfactory display is a hardware system that delivers controlled scent stimuli to a user, typically as part of a virtual reality, augmented reality, or multisensory interaction system. Designs range…
- Oligodactyly
- A congenital condition in which a person is born with fewer than the typical number of fingers or toes. The condition varies widely in presentation — some individuals may have fewer digits on one hand…
- Olmstead Decision (Olmstead v. L.C.)
- A landmark 1999 United States Supreme Court ruling that held requiring disabled people to live in institutional settings when they could live in the community constitutes unlawful discrimination under…
- Omakase (Omakase mode, I leave it to you)
- A Japanese word — literally 'I leave it to you' — adopted in human-robot interaction and assistive-AI research to describe a mode of user involvement in which the person defers all decisions to the sy…
- Omission (AI Omission, Information Omission)
- An AI error where the model fails to mention important information that is present in the input. In image descriptions for BLV users, omission can include failing to mention warning labels on medicati…
- Omission Error (Extra Text Error, Deletion Needed Error)
- A type of text error where extraneous or incorrect content is present and needs to be removed. Despite the name suggesting something missing, in text editing research this term refers to errors requir…
- Omnidirectional Camera (360-Degree Camera, 360 Camera, Panoramic Camera)
- A camera equipped with multiple wide-angle or fish-eye lenses that captures a complete 360-degree view of its surroundings in a single shot. The resulting equirectangular image can be projected into c…
- Omnidirectional wheelchair (Holonomic wheelchair)
- An electric wheelchair capable of moving in any direction — forward, backward, sideways, and diagonally — as well as rotating in place, typically using Mecanum wheels or similar omnidirectional drive …
- On Input (WCAG 3.2.2)
- WCAG 2.1 success criterion 3.2.2 (Level A) requires that changing the setting of any user interface component does not automatically cause a change of context (e.g., submitting a form, navigating to a…
- On-Body Gesture (On-Body Interaction, Body-Based Gesture)
- A gesture performed on or against one's own body rather than on a device surface or in the air. Examples include tapping the thigh, swiping along the forearm, or touching the ear to trigger a command …
- On-Body Interaction (Body-centric interaction, Skin input, On-body input)
- An interaction paradigm that uses the surface of the user's own body as an input medium, typically through gestures like taps, swipes, or touches on the skin. On-body interaction leverages tactile and…
- On-Demand Simplification (On-demand text simplification, User-initiated simplification)
- An interaction pattern for Automatic Text Simplification reading-assistance tools in which the user explicitly requests a simpler version of a word, phrase, or sentence — typically via hover, click, o…
- On-Device Processing (Local Processing, Edge Processing)
- Computing performed directly on a user's device (phone, tablet, or wearable) rather than sending data to external servers. On-device processing is particularly valuable for privacy-sensitive accessibi…
- On-Screen Keyboard (Virtual Keyboard, Software Keyboard, OSK)
- A software application that displays a visual representation of a keyboard on the computer screen, allowing users to type by selecting keys with a pointing device, head tracker, eye gaze system, or sw…
- On-Screen Text (OST, Visual Text, Burned-In Text)
- Text that appears visually within video content, including titles, subtitles, captions, signs, labels, credits, and any other written information displayed on screen. On-screen text must be read aloud…
- On-body Input (Skin-based Input, Body-based Interaction)
- An interaction technique that uses the surface of the user's own body — typically the hand, arm, or other skin areas — as an input surface for controlling digital devices. On-body input is sensed thro…
- On-device Recognition (On-Device Inference, Edge Recognition)
- Performing pattern recognition - such as sign language recognition, speech recognition, or computer vision - locally on the user's device rather than by sending input to a remote server. On-device rec…
- One-Handed Input (Single-Handed Operation, One-Handed Operation)
- One-handed input refers to interaction techniques and interface designs that can be operated using a single hand, accommodating users who have limited use of one limb due to amputation, hemiplegia, st…
- Online Accessibility Act (OAA, US Online Accessibility Act)
- A proposed US federal law (H.R. 1100, introduced in the 117th Congress) that would require consumer-facing websites and mobile apps of covered organisations to comply with Web Content Accessibility Gu…
- Online Braille (Web Braille, Digital Braille, Electronic Braille)
- Online Braille refers to Braille content that is generated, distributed, or accessed through the Internet or digital platforms, as opposed to traditional embossed paper Braille. This includes web-base…