If you are wondering what this little stop sign means, it's the famous Room Full.
Note that it isn't 100% reliable - it can be outdated, and occupancy can change dramatically between talks. But nevertheless, it's still a good indicator that you shouldn't be trying to squeeze into a talk if you are already late - better go to a different one, watch a live stream, or enjoy the Hallway Track.
https://fosdem.sojourner.rocks/2026/track/Collaboration%20and%20content%20management










