Unknown Components

Hi all,
I am new to grasshopper and recently I am looking at one grasshopper script but there is one unknown component inside. The command icon is like this2 . It has the same icon as “cherry picker” but the inputs and outputs are different. I was wondering if anyone knows what this command is. Thanks for any help in advance!

That icon was reused when I created the cherry picker object since it was much more apposite for that one. I think before it was used for the component which removes null data and/or empty branches from a tree.