Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 299 of 333
- Tone indicator (Tone tag)
- A text-based marker appended to online messages to explicitly signal the intended emotional tone or communicative intent, such as /s for sarcasm, /j for joking, /gen for genuine, or /srs for serious. …
- Tongue Display Unit (TDU, BrainPort, Tongue Electrotactile Display)
- A sensory substitution device that presents visual or spatial information through an array of electrodes placed on the tongue. The tongue is ideal for electrotactile stimulation because it has a very …
- Tool Substitution (Adaptive Tool Use, Alternative Tool Use)
- The practice of using a different tool than what is specified or expected to accomplish a task, common among people with disabilities who adapt their approaches based on available resources, physical …
- Tooltip (Form Field Tooltip, Accessible Name (PDF))
- In PDF forms, a tooltip is the programmatic label associated with a form field that assistive technologies read aloud when the user reaches that field. Unlike HTML, PDF does not have a native label-to…
- Topic Modeling (LDA, Latent Dirichlet Allocation)
- A machine learning technique that automatically discovers abstract themes or topics within a collection of documents by analyzing patterns of word co-occurrence. Latent Dirichlet Allocation (LDA) is t…
- Topic Segmentation (Text Segmentation, Topicalisation)
- A natural language processing technique that automatically divides a document into coherent sections based on changes in topic or subject matter. Topic segmentation algorithms detect boundaries where …
- Topicalization (Topic-Comment Structure)
- A grammatical construction common in American Sign Language and other sign languages in which the topic of a sentence is placed first and marked by non-manual signals — typically raised eyebrows, a he…
- Total Communication
- An approach to communication that incorporates all available modes and channels—including speech, gesture, facial expression, drawing, writing, pointing, props, and physical aids—rather than relying o…
- Touch Accessibility (Touchscreen Accessibility)
- The design and adaptation of touch-based interfaces to be usable by people with diverse motor, sensory, and cognitive abilities. Touch accessibility addresses challenges including insufficient target …
- Touch Drift (Finger Drift)
- The displacement of a finger's contact point on a touchscreen between the initial finger-down position and the final finger-up position during a single touch interaction. Touch drift measures how far …
- Touch Exploration (Explore by Touch, Touch-Based Exploration)
- An interaction method that allows users to discover on-screen content by moving their finger across a touchscreen, receiving audio feedback about elements under the fingertip. Touch exploration is fun…
- Touch Panel (Touch Tablet, Touch-Sensitive Panel, Digitizer Tablet)
- A flat, pressure-sensitive input surface that detects the position of a finger or stylus when it makes contact. Unlike touchscreens, which combine display and input on the same surface, a touch panel …
- Touch Reader (Tactile Reader, Tactile Graphics Reader)
- A person who reads and interprets information through touch, particularly tactile graphics, raised line drawings, and braille. Touch readers include blind and low-vision individuals who access spatial…
- Touch Screen Accessibility (Touchscreen Accessibility, Touch Input Accessibility)
- The design and implementation of touch-based interfaces so they can be effectively used by people with various disabilities, including those with motor impairments, low vision, or blindness. Touch scr…
- Touch Sensor (Touch-Sensitive Sensor, Tactile Sensor)
- An electronic component that detects physical contact or proximity of a finger or object on a surface. Touch sensors are used in accessible devices to enable direct tactile interaction, allowing blind…
- Touch Target (Tap Target, Hit Area, Target Size)
- A touch target is the area on a touchscreen interface that responds to a user's tap or touch input. Accessibility guidelines recommend minimum touch target sizes to ensure that people with motor impai…
- Touch Target Size (Tap Target Size, Target Size)
- The physical area of an interactive element on a touchscreen that responds to user input. Adequate touch target sizing is critical for accessibility, particularly for users with motor impairments who …
- Touch target (Tap target, Touch target size, Target size)
- The interactive area on a touchscreen or pen-based display that responds to user input when tapped or pressed. Touch target size is a critical accessibility consideration because targets that are too …
- Touch-Free Interaction (Contactless Interaction, No-Touch Interface)
- Interaction with digital systems without physically touching any device surface, achieved through gestures, voice, eye tracking, brain-computer interfaces, or proximity sensors. Touch-free interaction…
- Touch-to-Explore (Touch Exploration, Explore by Touch)
- An interaction mode used by touchscreen screen readers (such as VoiceOver on iOS and TalkBack on Android) where users drag their finger across the screen to discover and hear descriptions of interface…