A personal bookmarks feature would be useful on the Ask site, particularly if it supported categories. For example, occasionally I see posts where there is an issue with the documentation but it might be many months before it is revised. It would be handy to quickly bookmark the post and attend to it later.
fyi I do know browsers have this.
Does the exisiting feature not work for you? Tap the three dots under a post and select the bookmark icon.
I see a ribbon that I’ve been wary of. Must have been confused with another site where something similar is report post.
For such questions, the ad_hoc leg is probably Site Feedback where you can reach the site maintainers.
Explanations for the symbols may be found here: