What is a dummy head exactly?

Good day everyone. Hopefully this won't get lost in the spam that plagues this board.

Could someone explain what a dummy head is in a Linked List? I can't seem to find anything with Google, although I could be choosing my wording poorly. If there is somewhere to get the lowdown on what a dummy head is and how it is useful, I'd love to be directed to it.

Thank you all!
We'll be an army of theives
Of self-freed slaves
Of mild-mannered maids
We'll fight with whispers and blades
So get ready, a new day is dawning
- The New Wild West -- Jewel
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