What is this black flag in my code break bar?

Question

What is this? I fat fingered a key combo and I have no idea what it is..

I know its a dumb question but I tried googling it and nothing has come up. Maybe I do not kknow what to google to answer this for myself?

Answer 1

It's a bookmark, toggled using CTRL+K, CTRL+K.

You can also navigate between bookmarks using CTRL+K, CTRL+N for next bookmark, and CTRL+K, CTRL+P for previous bookmark.

They're also available through the Edit > Bookmarks menu.