A triad is a relationship structure in which three people are all romantically connected to each other. In a triad, every person is in a relationship with every other person: A is with B, B is with C, and A is with C. This distinguishes a triad from a V, in which one person is in the middle connecting two partners who are not in a relationship with each other. A triad is sometimes called a throuple, a word that blends three with couple.
The triad is one of the most frequently discussed configurations in polyamorous communities, partly because it is one of the simpler plural structures to conceptualize and partly because it is harder to form than it appears. The mathematical simplicity of three people all connected to each other does not translate into relational simplicity. Three people each in relationship with each other means three separate dyadic relationships plus the triadic group dynamic, which does not always emerge naturally from the dyads.
The phrase "unicorn hunting" describes a specific pattern of triad formation that has generated significant community discussion. A couple — often a man and a woman — seeks a bisexual woman who will join their relationship as a fully equal third. The "unicorn" label reflects how rare such a person is in practice: someone who is attracted to both existing partners equally, available for a new relationship, comfortable entering an already-established partnership, and willing to accept the dynamics that often come with that position. The hunt is often criticized because it treats the potential third as interchangeable, imposes equality as a requirement rather than allowing relationships to develop organically, and frequently privileges the couple's comfort over the incoming person's needs.
Triads that form more organically — through existing friendships or network connections, without a prescriptive vision of what they must look like — tend to have different dynamics. They still require the same careful communication and explicit navigation that any complex relationship structure needs, but they begin from the actual people and their actual feelings rather than from a predetermined template.
The word throuple serves the same referent as triad but carries a slightly different register. Triad is the more technical community term; throuple is more colloquial and has entered wider cultural vocabulary through appearances in popular media. Both describe the same structure: three people, all in relationship with each other.
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definition contributed by Tessakin