Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 141 of 333
- Head Tracking (Head Movement Tracking, Head-Controlled Input, Head Tracker)
- An assistive technology input method that translates natural head movements into computer cursor control or other input actions. Head tracking systems use cameras, infrared sensors, or depth sensors t…
- Head Wand (Head Pointer, Head Stick, Mouth Stick)
- A head wand is an assistive input device consisting of a pointer attached to a headband or held in the mouth, allowing people with limited or no hand and arm function to operate a keyboard, touchscree…
- Head-Mounted Display (HMD, VR Headset, AR Headset)
- A wearable device worn on the head that places a display in front of the user's eyes to present virtual or augmented content. HMDs range from fully immersive VR headsets (like Meta Quest) that replace…
- Head-Mounted Display (HMD) (HMD, Head-Mounted Display, Smart Glasses, AR Glasses)
- A display device worn on the head that places visual content in front of one or both eyes. Head-mounted displays include AR smart glasses (like Vuzix Blade), VR headsets, and mixed reality devices. In…
- Head-based Pointing (Head Tracking, Head Mouse, Head-controlled Input)
- An alternative input method that allows users to control an on-screen cursor by moving their head, typically tracked via a camera, infrared sensor, or inertial measurement unit. Head-based pointing is…
- Head-mounted display (HMD, Smart glasses, Head-worn display)
- A wearable device that positions a display in front of one or both eyes, either overlaying digital content onto the real world (optical see-through) or replacing the visual field with a camera-capture…
- Head-related transfer function (HRTF)
- A response function that describes how sound from a specific point in space is filtered by the shape of the outer ear, head, and torso before reaching the eardrum. HRTFs are unique to each individual …
- HeadMaster (HeadMaster Plus)
- An early head-pointing assistive technology device developed by Prentke Romich Company that translates head movements into mouse cursor movements on screen. The HeadMaster uses an ultrasonic sensor wo…
- Heading Navigation (Navigate by Headings)
- A screen reader navigation strategy that allows users to jump between heading elements (h1-h6) on a webpage, bypassing intermediate content to quickly find sections of interest. Heading navigation is …
- Heading Structure (Header Hierarchy, Heading Levels, Document Outline)
- The hierarchical organization of headings (H1 through H6 in HTML) used to define the logical structure and sections of a document or web page. Proper heading structure is one of the most critical acce…
- Heading hierarchy (Heading structure, Heading levels)
- The logical, nested structure of HTML heading elements (h1 through h6) that organizes web content into a navigable outline. A well-structured heading hierarchy uses heading levels sequentially without…
- Heading hierarchy (Heading structure, Heading levels, Document outline)
- The logical structure created by using HTML heading elements (h1 through h6) in a nested, hierarchical order to convey the organisation of content on a web page. A proper heading hierarchy starts with…
- Heads-Up Display (HUD)
- A transparent or overlay display that presents information in the user's direct line of sight without requiring them to look away from their current viewpoint. Originally developed for aviation, HUDs …
- Health Data Visualization (Health Data Display, Patient Data Visualization)
- The presentation of personal health information — such as blood glucose levels, blood pressure readings, activity data, or medication schedules — in visual formats including graphs, charts, trend line…
- Health Informatics (Medical Informatics, Clinical Informatics)
- The interdisciplinary field concerned with the design, development, and use of information technology and systems to improve healthcare delivery, management, and outcomes. Health informatics encompass…
- Health Literacy (Digital Health Literacy, eHealth Literacy)
- The degree to which individuals can obtain, process, understand, and act on health information and services needed to make appropriate health decisions. In the digital context, health literacy extends…
- Health Misinformation (Medical Misinformation, Health Disinformation)
- False or misleading health-related information that is spread regardless of intent to deceive. On social media and video platforms, health misinformation about conditions like ADHD can include inaccur…
- Health Monitoring (Remote Patient Monitoring, Health Surveillance)
- The continuous or periodic collection of health-related data using sensors, wearables, or smart home technology to track an individual's wellbeing and detect problems. Health monitoring systems may tr…
- Health-Related Impairment and Disability (HIID, Health-Related Impairments and Disabilities)
- A category of impairments that arise as a consequence of health conditions, both chronic and acute, rather than from a traditionally defined disability. HIIDs are characterized by four properties: the…
- Healthcare Access (Healthcare Accessibility)
- The ability of disabled people to obtain timely, appropriate, and respectful healthcare services. Healthcare access barriers include physical inaccessibility of medical facilities, communication barri…