When you specify that you select the Text and exercises > Display text menu item, you are shown this dialog:
At the bottom of this dialog, there is a checkbox labelled “Show link icons”. Currently, this only has an effect when working with the Old Testament, and only if you are using the Bible OL installation at bibleol.3bmoodle.dk.
If you put a check mark in this checkbox, you will see a icon with a P in a blue circle at the start of certain verses. For example Genesis 2:14:
This P is a hyperlink to a set of pictures relating to that verse. The pictures are located at the website resources.3bmoodle.dk
Instead of a P in a blue circle you may find a D, V, or U in a green circle. In this case the letter is a hyperlink to a document, video, or other URL. These other icons are, however, almost unused at present.