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 #+NAME: 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