Next to the topics you have round or lightbulb shaped icons. Sometimes the edges are red or blue, with(outh) a red star, text is moving or not etc.
I wondered what it means. I tried to figure it out myself and thought it has something to do with active or not, new or unread posts... but when I checked the icons with wat was happening in the topics I couldn't find any pattern in it.
Thanks & Blessings,