[samb1729]

What does GP stand for in this context? I keep seeing it on HN and figured out what it means, but what do the actual letters stand for?

[squeaky-clean]

Grandparent. As in your comment is my parent comment, and your parent comment would be my grandparent, and so on.

[samb1729]

Makes sense, thanks. I've seen 'OP' (original post/poster) enough times that I thought it was a variant on that and couldn't make sense of it.