Dyad
A dyad is a relationship with two people.
Dyads can be monogamous or multigamous. A multigamous dyad could have separate relationships that are not connected to each other.
Polycule Configurations
Dyad
Two people in a relationships with each otherV
One person in a relationship with two peopleTriad
Three people in a relationship with each otherQuad
Four people in a relationship with each other