Mystery node - what node is this?

Trying to recreate a Blueprint but unclear what the circled node in the attached image is. Can any Blueprint experts help?

well, not a mega-expert here but that node : get the root component of the actor reference you have on the left (i think is an actors array , right? )
Since all operation and nodes are strictly defined to work with defined entity.
There is a node to move actors
There is a node to move a component

Sometimes if you need to get the parent or the child of what you have.