When you start a thread, you can choose to make it recurring if you want the same thread to automatically post on a recurring basis.
Threads can be great for collecting asynchronous updates from your team. However, it can be a hassle to re-create the same thread over and over again to collect those updates.
By creating a recurring thread, the author will only have to create the thread once and then a new version of the thread will be automatically posted based on the schedule you set. This means instead of posting the same "call for agenda items" before your weekly meeting, you only need to do that once, and just set the time when you want the thread to be posted every week.
Learn how to create a recurring thread. You'll be able to view any recurring threads you create from Sent.