What are the (new?) icons on the left in the tracklist?

[WimYogya]

In recent versions I already saw a blue two-note icon on the left in the tracklist. No clue what it means.
Now, in an update of my library I see mainly blue two-notes but also a few envelopes with a music sheet coming out of it.
What do they mean?
Only for information, or do they also represent some activity or option?

[redwing]

They are library & inbox node icons that only appear on the search result so that you can instantly know what node the track belongs to.

[WimYogya]

But what do they MEAN? And what is their function?

[redwing]

Just let you know the source node.

[WimYogya]

Had to search a bit, but now I understand. Thanks...

[redwing]

It's especially useful when you want to compare duplicate tracks in different nodes. Say you have an old album in library and the new album in inbox, then type the album name in search box and you get both albums on the same tab (search result) with a node icon next to tracks without having to go back and forth between different nodes.