From The Document Foundation Wiki
- Images, figures, tables, and the like should have captions, with these exceptions:
- When a figure is located within a table and the adjacent cell in the table explains the figure.
- When a figure (such as a picture of a toolbar) follows closely after a heading that describes the figure.
- When the graphic is very small (such as an icon) and is within or beside text that describes it.
- Use the caption feature in Writer for greater consistency.
- Caption rules:
- Label images, figures, and drawings “Figure”, not “Illustration” or any other name.
- Position captions below images, figures, and drawings, and above tables and code listings.
- Number all figures that have captions. Use a number range variable; never type figure or table numbers. Writer’s caption feature applies number range variables automatically.