A signal is an automatic content feed you set up to track specific people, #hashtags, or $cashtags. To create a new signal, click + in the top left of the screen and choose Create a Signal. Add the people and keywords you wish to track and click Create.
Any time these names or terms are used in chat, you’ll receive a notification in your left nav under Signals. Click the Context link to go to the original message where the keyword appeared.