Blue symbol appears when I add a text box
I teach a Pages class to seniors and this question has come up and I can't find an answer anywhere. When a text box is added in a Pages document a symbol appears that is a blue line with a ball on top - kind of looks like a stickpin. This appears when the text box is active and disappears when it is inactive. I have attempted to right click it or copy and paste it (for this question) land it turns into a Paragraph marker when I highlight it. It moves with the text box. I'd like to explain what it is or at least know if there's any useful purpose for it?
Thanks,
iMac