Omegaverse, also known as A/B/O or α/β/Ω (an abbreviation for "alpha/beta/omega"), is a subgenre of speculative erotic fiction. The genre supposes the existence of a dominance hierarchy among humans, as similar to that associated with wolves and other canids, that is composed of dominant "alphas", neutral "betas", and submissive "omegas". This hierarchy determines how people interact with one another in romantic, erotic and sexual contexts. Though tropes associated with Omegaverse can be observed in works published as early as the 1960s, the genre formally originated in the 2010s as a subgenre of erotic slash (same-sex) fan fiction, as a fusion of elements of werewolf fiction and the mpreg subgenre.