Since I had zero clue:

In polyamory, a polycule is a group of individuals involved in romanticrelationships that connect all the members in the group.[1][2] It is not necessary for every individual of the polycule to be in a relationship with every other individual, and also not common.[3][4] The most simple and arguably most common polycule structure is a V shaped structure, a three-person polycule where one person is dating the two others, but the two others are not dating one another.