Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Personal Digital Assistant(also: PDA, Handheld Computer, Pocket PC)
- A portable handheld computing device popular in the late 1990s and early 2000s that combined features like a calendar, contacts, note-taking, and basic application support in a pocket-sized form factor with a touchscreen interface. In accessibility research, PDAs like the iPAQ…
- Personal Voice(also: Voice Banking, AI Voice Clone)
- A technology that creates a synthetic replica of a person's voice from recorded speech samples, enabling text-to-speech output that sounds like the individual rather than a generic electronic voice. Apple's Personal Voice feature (iOS 17+) allows users to train an AI model of…
- Phoneme(also: Speech Sound)
- The smallest unit of sound in a language that can distinguish one word from another. For example, the /b/ and /p/ sounds in "bat" and "pat" are different phonemes. American English has approximately 39 phonemes, compared to 26 letters in the alphabet. In accessibility and AAC…
- Photo-based Communication(also: Visual Communication Aid, Image-based Communication)
- A communication strategy that uses photographs or images as the primary medium for conveying meaning, sharing experiences, and supporting conversation. For people with aphasia, intellectual disabilities, or other conditions that affect spoken and written language, photographs…
- Pictograph(also: Pictogram, Picture Symbol, Graphic Symbol)
- A simplified visual symbol or image that represents a word, concept, or action, used as an alternative or supplement to written text. Pictograph systems such as Sclera, Beta, and Widgit are widely used in augmentative and alternative communication (AAC) to support people with…
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