# Legend

The key that explains what each colour or mark stands for.

**Source:** “A legend should always be used if there are multiple categories of data (in different colours).” [Data Visualization: Best Practices (Statistics Canada)](https://www150.statcan.gc.ca/n1/pub/89-26-0005/892600052022001-eng.pdf)

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Published 2026-10-29. Web page: https://www.mackenziebowes.com/reference/glossary/legend