What does GP mean in HN comments?

Question

When I read HN comments sometimes I see commenters using GP to refer to someone else in the comment section. However, I don't understand what it actually means.Is it referring to the parent comment, the one who submitted the link or someone else entierly?

okasaki · Accepted Answer

Grand-parent. The parent of the parent.

rolph · Answer

Generating Poster, referring to the poster that created or initated the post; the thread; or some turn of discourse,in comments, depending on context
GrandParent thread
sometimes used loosely with OP original poster or originating parent

What does GP mean in HN comments?

When I read HN comments sometimes I see commenters using GP to refer to someone else in the comment section. However, I don't understand what it actually means.Is it referring to the parent comment, the one who submitted the link or someone else entierly?

Grand-parent. The parent of the parent.

Generating Poster, referring to the poster that created or initated the post; the thread; or some turn of discourse,in comments, depending on contextGrandParent threadsometimes used loosely with OP original poster or originating parent

When I read HN comments sometimes I see commenters using GP to refer to someone else in the comment section. However, I don't understand what it actually means.
Is it referring to the parent comment, the one who submitted the link or someone else entierly?

Generating Poster, referring to the poster that created or initated the post; the thread; or some turn of discourse,in comments, depending on context
GrandParent thread
sometimes used loosely with OP original poster or originating parent