This is the official manual for the latest Org-mode release.
ODT format handles labeling and captioning of objects based on their types. Inline images, tables, LaTeX fragments, and Math formulas are numbered and captioned separately. Each object also gets a unique sequence number based on its order of first appearance in the Org file. Each category has its own sequence. A caption is just a label applied to these objects.
#+CAPTION: Bell curve #+LABEL: fig:SED-HR4049 [[./img/a.png]]
When rendered, it may show as follows in the exported document:
Figure 2: Bell curve
To modify the category component of the caption, customize the option
org-odt-category-map-alist. For example, to tag embedded images with
the string ‘Illustration’ instead of the default string ‘Figure’,
use the following setting:
(setq org-odt-category-map-alist '(("__Figure__" "Illustration" "value" "Figure" org-odt--enumerable-image-p)))
With the above modification, the previous example changes to:
Illustration 2: Bell curve