Yes, but what is described is many-to-many relationships with a typically greater than 1:1 female:male ratio, which is not polyandry which is a system many-to-one female-to-male relationships.
Actually, I somehow followed the GPs error: both my post above and the post it responds to use “polyandry” incorrectly, what is described by it is actually “polygyny”. “Polyandry” is relationship with one woman and two or more men.
In "The Moon is a Harsh Mistress", it is described as a 'line marriage'. I have read the book, and thought the idea was quite interesting. The more recent book "Luna: New Moon" by Ian McDonald explores similar ideas (and is also set on the moon).
I was trying to inform the parent commenter of the 'opposite' of "polygamy", but this was apparently unappreciated on HN. On that note, I think I will no longer be commenting on HN, due to the aggressive downvoting. I am aware of the guideline about commenting on downvotes, but I no longer care.
