Secondary text field next to Part name within Explorer hierarchy?

I was going about my day renaming parts per usual when I discovered that there’s a seemingly hidden secondary text field beside each part name.

textfield1
textfield2

What is this for? I’ve never seen it before and I couldn’t find the correct search terms for google to find any information about it. It seems to only appear if you use the renaming shortcut F2

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Actually, I also don’t know why they have provided this thing.
I guess, need to look on through it in a detailed manner.