Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Haptic Display(also: Tactile Display, Pin-Matrix Display, Refreshable Tactile Display)
- A device that conveys information through the sense of touch by dynamically raising and lowering physical elements (typically pins) to create tactile patterns. In accessibility, haptic displays range from single-line refreshable Braille displays used with screen readers to large…
- Nemeth Braille(also: Nemeth Code, Nemeth Braille Code for Mathematics)
- A specialized Braille code designed for representing mathematical and scientific notation, developed by Abraham Nemeth and adopted by the Library of Congress. Unlike literary Braille, Nemeth Braille has unique symbols for numbers, operators, fractions, radicals, Greek letters,…
- Passive Pin Retention
- A mechanical technique used in refreshable Braille display design where pins are held in their raised or lowered positions by a passive mechanical structure rather than by continuously powered actuators. In traditional Braille displays, each pin requires its own actuator to…
- Piezoelectric Actuator(also: Piezo Actuator, Piezoelectric Bimorph)
- A device that converts electrical energy into precise mechanical motion using the piezoelectric effect — the property of certain materials to change shape when an electric voltage is applied. In assistive technology, piezoelectric actuators are the dominant mechanism used in…
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