Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Scalable Vector Graphics(also: SVG)
- An XML-based vector image format for two-dimensional graphics that supports interactivity and animation. Unlike bitmap formats (JPEG, PNG, GIF) which store images as grids of pixels, SVG describes shapes, paths, and text mathematically, allowing images to scale without loss of…
- Semantic Level(also: Semantic Content Level, Alt Text Semantic Level)
- A framework for categorizing the depth of information conveyed in alt text descriptions of data visualizations, introduced by Lundgard and Satyanarayan. The four levels are: Level 1 (construction details such as chart type, axes, and encodings), Level 2 (statistical properties…
- Small Multiples
- A series of similar graphics or charts arranged in a grid or sequence, each showing a different frame, condition, or time point, used to illustrate change or comparison. In tactile graphics, small multiples are the traditional method of representing movement or temporal change —…
- Statistical Graph(also: Statistical Chart, Data Graph, Quantitative Graph)
- A visual representation of numerical or statistical data using geometric elements such as lines, bars, points, or areas to convey patterns, trends, relationships, and comparisons. Common types include line graphs (showing trends over time), bar charts (comparing categories), pie…
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