Reply To: What is this hidden character?

BoazE is, I believe, correct! These are hyperlink destination characters. See page 4 of the special characters PDF that you mentioned:

https://creativepro.com/downloads/ids_specialchars.pdf

I'm embarrassed to admit that I was fooled by a Safari bug. For some reason, attached images don't expand properly for me in in this forum when I click on them. So I was gauging your screen shots by squinting at the tiny thumbnails. Silly me. When I switched to Chrome, I could click to expand them.

You can make your own hyperlink destinations by clicking in text and choosing New Hyperlink Destination from the hyperlinks panel menu. Make a text anchor destination and you'll see that it shows up the same as this. Yes?