A "tag system" is a way to organize or categorize things by attaching labels or tags to them. It helps identify or sort items based on specific characteristics or attributes. Full definition
The ability to check best rated and most downloaded content as well as the new tags system really help you find what you're looking for. (gamingbolt.com)
They had a new luggage tag system they allowed you setup your flights within an app and then the tags change in real time. (goodereader.com)
Yeah, I know most of you guys are probably tired of em, but this game is pretty cool because of the unique tag system where you play two characters. (steparu.com)