Icons under tables

I have noticed that in my new version of SQL server, I see two icons in the tables folder.
One looks like a calendar with a clock and says “(system-versioned)” and the other looks like a normal table.
I was just wondering if someone could explain why and when the calendar icon will appear and what it means please.
Thanks so much!

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That will be for a temporal table, if the table is configured for system versioning. More information here: