Glossary

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Sighted Assistance(also: Visual Interpreting, Remote Sighted Assistance)

Sighted assistance refers to services that connect blind or low-vision individuals with sighted people who can provide visual information on demand, typically through a live video call from a smartphone or smart glasses. Services like Be My Eyes (volunteer-based) and Aira…

Sighted Guide(also: Sighted Guide Technique, Human Guide)

A technique in which a sighted person assists a blind or low vision individual with navigation and orientation by serving as a visual reference and mobility aid. In physical settings, the blind person typically holds the guide's arm just above the elbow and walks a half-step…

Sign Language Dictionary(also: SL Dictionary, ASL Dictionary)

A reference tool that allows users to look up signs in a sign language, providing video demonstrations, definitions, and usage examples. Sign language dictionaries can be organized by English gloss (word-based lookup), linguistic features (handshape, location, movement), or…

Sign Language Interface(also: Sign-language interface, Signing interface)

A computing interface that accepts input from, or presents output to, a user in a signed language such as American Sign Language (ASL) or British Sign Language (BSL), rather than assuming a spoken or written language. Sign-language interfaces span sign-language recognition…

Sign Language Machine Translation(also: English-to-ASL Translation, Sign Language MT, Text-to-Sign Translation)

The automatic translation of written or spoken text into a signed language (or vice versa) using computational methods, typically producing output as an animated signing avatar or, less commonly, as recorded video clips. Because signed languages such as American Sign Language…

Sign Language Synthesis(also: Sign Language Generation, Sign Language Avatar, Signing Avatar)

Sign language synthesis is the automated generation of sign language output, typically through 3D animated avatars or computer graphics, from text or other input. The technology involves translating written or spoken language into the grammar, vocabulary, and spatial expressions…

Sign language(also: Manual language, Visual-gestural language)

A natural language that uses manual articulation (handshapes, movement, location relative to the body), facial expressions, and body posture to convey meaning, serving as the primary or preferred language of many deaf and hard-of-hearing people. Sign languages are fully…

Sign language animation(also: ASL animation, Signing avatar technology)

Computer-generated animated characters that produce sign language from text or script input, offering a potentially scalable alternative to pre-recorded human signer videos for making information accessible to deaf users. Sign language animation systems must convey not only…

Sign language avatar(also: Signing avatar, Virtual signer)

A computer-generated animated character that produces sign language from text or speech input. While sign language avatars hold potential for scaling deaf accessibility, their premature deployment raises significant concerns: the World Federation of the Deaf and World…

Sign language translation(also: SLT, Sign-to-text translation)

The automatic conversion of sign language video into written or spoken language text using machine learning. Unlike sign language recognition, which identifies individual signs or glosses, sign language translation produces fluent natural language output that accounts for the…

Signal Drift(also: Baseline Drift, DC Drift)

Signal drift is the gradual, unintended change in the baseline level of a measured signal over time, caused by factors unrelated to the intended measurement. In bio-electrical sensing for assistive technology, drift is a major challenge — for example, in electrooculography…

Signal Fingerprinting(also: Wireless Fingerprinting, RF Fingerprinting, Bluetooth Fingerprinting)

Signal fingerprinting is a technique used in indoor positioning systems where the unique pattern of wireless signal strengths (such as Bluetooth, Wi-Fi, or RFID) at specific locations within a building is recorded and stored as a reference map. During navigation, a mobile device…

Signal-to-Noise Ratio(also: SNR, S/N Ratio)

A measure of the strength of a desired signal relative to background noise, expressed in decibels (dB). In accessibility, signal-to-noise ratio is critical for the effectiveness of auditory interfaces: if background noise is too high relative to device audio output, speech…

Signature Guide(also: Writing Guide, Handwriting Guide)

A small rectangular card, typically credit-card sized, with a cutout opening that enables blind people to write or sign in a straight line on paper. Signature guides are one of the simplest and most widely used low-tech assistive tools for blind people, providing a tactile frame…

Signer-Independent Recognition(also: signer-independent SLR)

A sign language recognition approach designed to work with signers whose data was not included in the training set. Similar to speaker-independent speech recognition, signer-independent systems must handle variations in signing style, hand size, speed, and regional signing…

Signing Avatar(also: Sign Language Avatar, Virtual Signer)

A 3D computer-generated character that produces sign language through animated hand movements, facial expressions, and body posture. Signing avatars are used in educational contexts to deliver accessible sign language instruction, provide real-time multi-angle content, and offer…

Signing Avatar(also: Sign Language Avatar, Virtual Signer)

A computer-generated animated character that produces sign language output, translating text or spoken content into visual sign language for deaf and hard of hearing users. Signing avatars are used in applications such as public digital terminals, websites, and educational…

Silent Speech(also: Silent Speech Interface, SSI)

Communication technologies that generate intelligible speech from non-acoustic signals produced during the intent or attempt to speak, without requiring audible voicing. Input modalities include surface electromyography of articulatory muscles, ultrasound tongue imaging,…

Simplified Interface(also: Reduced Complexity Interface, Easy Mode)

A user interface design that intentionally reduces the number of features, options, and interaction steps to make a product or service accessible to users who would be overwhelmed by a standard interface. Simplified interfaces typically remove non-essential functionality,…

Single Switch(also: Single Switch Access, One Switch)

An assistive technology input device that provides a single binary action — on or off — enabling people with severe motor impairments to interact with computers and communication devices. Switches can be activated by virtually any reliable voluntary movement, including a blink,…

Single-Message AAC Device(also: BIGmack, Single-Switch Communicator, Voice Output Communication Aid)

A simple augmentative and alternative communication (AAC) device that records and plays back a single message when activated, typically via a large button or switch. Examples include the BIGmack Switch and similar products. These devices are often used as introductory AAC tools…

Sip-and-Puff(also: Sip and Puff Switch, Pneumatic Switch)

An assistive technology input device that detects air pressure changes from a user sipping (inhaling) or puffing (exhaling) through a straw or tube to generate control signals. Sip-and-puff systems are primarily used by people with severe motor impairments, particularly those…

Situation Awareness(also: SA, Situational Awareness)

The perception and understanding of one's current environment, including the identification of relevant elements, comprehension of their meaning, and projection of their future status. In accessibility and assistive technology contexts, situation awareness refers to systems that…

Skeleton Tracking(also: skeletal tracking, body tracking, pose estimation)

Technology that detects and tracks the positions of human body joints (such as head, shoulders, elbows, hands) in real-time from camera or depth sensor data. In accessibility applications, skeleton tracking enables gesture-based interfaces, sign language recognition, and…

Skilled Vision(also: Vernacular Vision, Professional Vision)

Skilled vision is a concept from visual culture and anthropology that describes the process of learning to see and interpret visual information in specialized ways within a particular community of practice. Originally applied to professional fields (e.g., radiologists learning…

Skimming(also: Scanning, Speed Reading, Content Skimming)

Skimming is a speed-reading technique in which a reader quickly glances through text to get the general idea or gist without reading every word. Sighted readers skim by scanning headlines, bold text, first sentences of paragraphs, and visually prominent content. For blind and…

Skimming Interface(also: Skim Reading Tool, Speed Reading Interface)

A technology interface designed to help users quickly scan and identify relevant content within a text without reading every word. Skimming interfaces have been particularly explored for blind and low vision users who use screen readers, where linear reading can be extremely…

Skin Stretch Display(also: Skin Stretch, Lateral Skin Deformation Display, STReSS)

A type of haptic display technology that produces tactile feedback by laterally stretching the skin of the user's fingertip, rather than using raised pins or vibration. Skin stretch displays typically use arrays of small actuators (such as piezoelectric bending motors) that…

Slide Rule

A pioneering touch-based screen reader interaction technique for mobile devices, developed by Kane et al. in 2008, that makes touchscreen content accessible to blind users through finger-driven exploration. Slide Rule allows users to scan items by dragging a finger across the…

Smart Cane(also: Electronic Cane, Intelligent Cane)

An enhanced version of the traditional white cane that incorporates electronic sensors — typically ultrasonic or infrared — to detect obstacles beyond the range of physical contact, providing haptic or auditory feedback to the user. Smart canes can detect obstacles at waist or…

Smart Display(also: Smart Screen, Voice Assistant Display)

A voice-controlled device that combines a smart speaker with a built-in touchscreen, enabling multimodal interaction through voice commands, visual output, and touch input. Examples include the Amazon Echo Show and Google Nest Hub. Smart displays offer accessibility advantages…

Smart Environment(also: Intelligent Environment, Smart Space)

A physical space equipped with sensors, computing devices, and networked systems that can monitor conditions, infer context, and respond to the activities and needs of occupants. Smart environments aim to improve quality of life by automating tasks and providing contextual…

Smart Glasses(also: AR Glasses, Assistive Smart Glasses)

Smart glasses are head-mounted wearable devices that incorporate cameras, microphones, speakers, and computing capabilities into an eyeglass form factor. For people who are blind or have low vision, smart glasses can use computer vision and AI to provide real-time information…

Smart Home(also: Home Automation, Connected Home)

A residence equipped with networked devices and systems that can be monitored and controlled remotely or automatically, including lighting, heating, security, and entertainment systems. Smart home technology has significant accessibility potential — enabling people with motor…

Smart Home Accessibility(also: Accessible Smart Home, Smart Home Automation)

The design and implementation of connected home technologies — such as voice-controlled lighting, automated door locks, smart thermostats, and appliance controls — in ways that are usable by people with disabilities. Smart home accessibility enables greater independence by…

Smart Home Technology(also: SHT, Smart Home Devices)

Connected devices and systems within a home that can be controlled remotely or automated, including smart speakers, thermostats, lighting, locks, cameras, sensors, and blinds. Smart home technology uses Internet of Things connectivity, voice control, and programmable rules to…

Smart Ring(also: Ring-Form Wearable)

A wearable computing device worn on a finger, typically combining sensors (motion, biometric, or camera) and/or actuators (vibration, kinesthetic feedback) in a ring form factor. In accessibility, smart rings have been proposed as discreet input devices, vibrotactile navigation…

Smart Speaker(also: Voice-Activated Speaker, Intelligent Speaker)

A wireless speaker with an integrated voice assistant that responds to spoken commands, such as Amazon Echo (Alexa), Google Home (Google Assistant), or Apple HomePod (Siri). Smart speakers serve as central hubs for smart home control, allowing users to operate connected devices,…

Smartglasses(also: Smart Glasses, AR Glasses, Connected Glasses)

Eyewear with integrated computing capabilities including sensors, displays, cameras, and connectivity that overlay digital information onto the wearer's field of view or provide hands-free access to computing functions. Smartglasses encompass several subcategories: passive…

Smartphone Accessibility(also: Mobile Phone Accessibility)

The design and adaptation of smartphone hardware, operating systems, and applications to be usable by people with disabilities. Smartphones have become increasingly important as assistive technology platforms due to their widespread availability, built-in accessibility features…

Smartphones as Assistive Technology(also: Mobile AT, Phone-Based AT)

The use of mainstream smartphones as assistive devices through built-in accessibility features (screen readers, magnification, live captions, sound amplification) and downloadable applications that support independence for people with disabilities. In low- and middle-income…

Smartwatch(also: Smart Watch, Wrist-Worn Device)

A wrist-worn computing device with a small touchscreen display that provides notifications, health tracking, and app functionality beyond timekeeping. Smartwatches present significant accessibility challenges for users with motor impairments due to their small touch targets,…

Social Acceptability(also: Social Acceptance, Technology Stigma)

The degree to which the use of an assistive technology or interaction technique is perceived as socially appropriate by both the user and those around them. Social acceptability is a critical but often underestimated factor in assistive technology adoption. Users may reject…

Social Acceptance(also: Public acceptance, Bystander acceptance)

In assistive technology research, the degree to which bystanders and the broader public accept the presence and use of a device in shared spaces — and the degree to which the user feels comfortable using it in public. Low social acceptance can drive device abandonment even when…

Social Marking(also: Stigma Marking, Social Visibility of Disability)

In accessibility contexts, social marking refers to the way assistive technologies or accommodations can draw unwanted attention to a person's disability, making their impairment visible in social situations where they might otherwise go unnoticed. Research has shown that users…

Social Playware(also: Interactive Playware, Technology-Mediated Play)

Intelligent hardware and software systems designed to create playful interactive experiences that encourage learning, social interaction, and communication between users. In accessibility and therapeutic contexts, social playware is used to promote social skills development in…

Social Robot(also: Companion Robot, Assistive Social Robot)

A robot designed to interact with people in socially meaningful ways, using verbal communication, gestures, and responsive behaviors to engage users. In accessibility contexts, social robots like SoftBank's Pepper have shown potential as confidence-building mentors, health…

Social Wayfinding(also: Social Navigation Assistance)

Social wayfinding refers to the capacity to perceive and navigate the dynamics of a social scene, not just its physical layout. It covers identifying who is present, where they are oriented, whether they are available for interaction, what they are doing, and how they are…

Social robot(also: Socially assistive robot, Companion robot)

A robot designed to interact and communicate with people in socially meaningful ways, often through movement, sound, or simulated emotional expression. In accessibility contexts, social robots are used to support neurodivergent individuals, older adults, and people with…

Socially Assistive Robot(also: SAR, Social Robot)

A robot designed to assist people through social interaction rather than physical manipulation. Socially assistive robots use embodied presence, movement, and social behaviors such as gaze, gestures, and expressions to provide support in contexts including therapy, education,…