Triad
A triad is a relationship with three people where each person is in a relationship with the other two.
This differs from a relationship where only one person is in a relationship with the other two.
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