If you are in a Circle, any participant in the Circle can set a topic that will be seen by all other participants in the Space:

Setting a topic can let people know what is being discussed in the conversation.
For example:
Hosting a training session? Name each Circle by workshop or training topic.
Here for a game night? Let each team name their own Circle.
Here to network? Direct attendees to Circles by topic.
How do I assign a topic?Form a Circle in your Space
Click the "set Circle topic" button below the Circle
Name your topic (max. 16 characters)