As in: the New ribbon over the upper-left corner of newly imported album art.
IIRC, New used to mean: not listened to yet. But now, the New label goes away after about a week or so, listened to or not - I think? I would use that label to keep track of newly imported music I had not, yet enjoyed.
Now, I’m not sure how to replicate that behavior. With iTunes, I would simply create SmartPlaylists, based on the Play Count metadata. I don’t see anything like this in the Focus settings.