Just wondered! :/
Jul 15th 2021 Official Post #2 I believe it's a thread when someone asks a question and there's an option to mark the thread as resolved.It's probably unnecessary, so thanks for pointing it out as I've just been ignoring it up until now.
Splinter Aug 12th 2021 Moved the thread from forum How To use The Forum to forum Site Layout and Forum Tips.
Splinter Aug 12th 2021 Moved the thread from forum Site Layout and Forum Tips to forum How To use The Forum.