We seem to have had different kinds of experiences and know different people because you are the only person I know or know of who has a closed poly relationship (obviously, others exist). I’ve even known of three people who live together and consider themselves in a marriage-like commitment who each still sees other people as well.

There are lots of polycule maps out there, although obviously, those are only generalizations since every poly set up is individual.

Here’s a great comprehensive glossary of poly terms.

Glossary of Polyamory Terms - More Than Two