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Grandparent comment, i.e., two links up in the comment tree.

(It's a common term on internet forums -- I learned it from Slashdot years ago)

Thank you very much. I thought of searching the web but GP is too generic a term.

GP grand parent https://news.ycombinator.com/item?id=8363625

GrandParent comment.

The comment directly above is the parent, and the comment above the parent is the grandparent—in this case the GP they’re referring to was 1e-9’s comment.