Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Haptic Graph(also: Haptic Chart, Force-feedback Graph)
- A haptic graph is a non-visual rendering of a chart or graph — a bar chart, line graph, scatter plot, or mathematical function — that a blind or low-vision user explores by touch, typically through a force-feedback haptic device such as the PHANToM or a vibrotactile tablet.…
- Health Data Visualization(also: 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 lines, and indicators designed to help patients understand and manage their health…
- Heat Map(also: Heatmap, Attention Map, Gaze Map)
- A data visualization technique that uses colour intensity to represent the distribution and density of user attention or interaction on a page or interface. In eye tracking research, heat maps aggregate fixation data from multiple users, with warmer colours (red, orange)…
- Height-Field Surface(also: Surface plot, Heightfield plot, 2.5D surface)
- A type of 3D data visualisation in which a scalar value (for example, elevation, intensity, pressure, or probability) is plotted over a two-dimensional domain, producing a continuous surface that can be rendered as a mesh, contour map, or draped cloth. Height-field surfaces are…
- Hypergraph
- A mathematical structure that generalises both trees and graphs by allowing edges (called hyperedges) to connect any number of nodes rather than being limited to exactly two. In the context of accessible graphical representations, hypergraphs are used to model the visual…
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