Charts / Glossary
Series
A chart word, with the charts that use it.
Definition
A series is one set of values drawn together, such as one line or one colour of bars. Charts with several series give each its own colour and name.
Updated Nov 2, 2026
- 01One seriesOne region's values, joined as one line.
- 02Its nameEach series is named in the legend.
Where you see it
012 · Multi-lineChange over time · AI data
002 · Grouped barsCompare items · SaaS data
003 · Stacked barsPart of a whole · Fintech data
Common mistakes
Too many series
Past five or six the lines tangle. Use small multiples or a horizon chart.
Series in different units
Give each unit its own axis, or its own chart.
Questions
Series or category?
A category is the group; a series is the values drawn for it.
How many series fit on a line chart?
Up to about six stay readable.
Related terms
- Category
- Legend
- Time series
- Stacked
Every chart word, A to Z.
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