(I’m guessing you’ve seen me around @omegaverse-headcanons hm?)

I’m actually just dumping my own headcanons because I see people use those terms but each author is different in how they go about it but here’s what I usually see/think

THE RARE DYNAMICS (ranked by occurrence) 

Deltas (Δ) are socially submissive Betas (Β). Betas tend to be the right-hand man/woman, and then Deltas are the assistants to Betas. They don't provide calming qualities like Betas do, but they are almost hyper-keen to things like attraction between two people, when a heat will occur, and what EXACTLY an Alpha/Gamma should do to win over a Omega/Sigma. They are also hyper-empathetic.

Gammas (Γ) are socially submissive Alphas (Α), they’re not as stubborn as their counterparts and are usually on the gentler side, but that doesn't mean sweet Alphas are automatically Gammas. Gammas usually refrain from fighting and other shows of dominance, but don't hesitate to smother Omegas with love. 

Sigmas (Σ) are socially dominant Omegas (Ω), they are just as aggressive as Alphas and often fight with one another. Also, as children, Sigmas and Alphas do typically fight with one another, but due to Sigmas being biological Omegas, they’re still weaker. Sigmas often tease their Omega friends about their nesting habits, as Sigmas do not nest much outside of heat and pregnancy.

And here we get into the crazier stuff that I really don't add in my personal universe but they do provide variety and extra windows for darkfics if you’re looking for them: 

Epsilons (Ε) are the bridge between Alphas and Betas and only occur with an Alpha and a Beta parent. They are typically seen with Zetas (Ζ) and Iotas (I) Epsilons are similar to Alphas in their genitals but have the sharp teeth and scent of Betas. They do not have typical shows of dominance, but it's very common for Epsilons to be cunning and tricking people to show their dominance (which is why people don't trust Epsilons often). 

Iotas (I) are the bridge between Omegas and Betas. They go through shorter heats, and have the sharp teeth and scents of Betas. Iotas typically need to be forced or tricked into submission which is why it's very common for Epsilons and Iotas to be mated. They do not nest, they don't care for it. 

Zetas (Z) are the truly neutral. They don't have pheromones or any special skills, and were actually considered genetically deficit until the late 20th century. Typically people will tell you Zetas are exempt from the hierarchy. 

Thetas (Θ) are actually super dangerous. Thetas have a genetic mutation (that assumedly is a mutated Beta gene) that causes their “calming scent” to knock people out entirely, and it's not uncommon for Thetas to be recruited by the army as soldiers. Thetas are required to take medication that blocks their scent, but they can pass for Zetas or Betas in public. Typically exempt from the hierarchy. 

Complete hierarchy: 

Alphas

Gammas

Epsilons 

Betas

Deltas

Iotas

Sigmas

Omegas

Exemptions:

Zetas 

Thetas