Just... just LOOK at all those icons!
You know what's funny? The bottom three icons are new: it's Google Meet (one of 39 messenger services from Google which was renamed 17 times during April). The camera icon is "Start a meeting". The keyboard icon is "Join a meeting". The speech bubble icon is... nothing! It just becomes a title on hover!
But wait, there's more! The separator line with a handler thingy — you can resize this "meet" section with it. But only by 5 pixels upwards and downwards. I suspect it's there for the future, when you have multiple meetings going on and want to resize the list because it doesn't fit the sidebar because it's full of endless icons and labels.