Pop-psychology has created easy-to-identify “personalities” that are named after Greek letters: alpha, beta, gamma, omega, and sigma, among many possibilities. Most of those who could identify as “sigma” people can also be readily seen as Xenos.

-- The "Sigma" Craze

There is a craze out there.

https://www.lovepanky.com/women/girl-talk/sigma-female

--- Independent to the Core 

--- Intuitive

--- Strategically Social

--- Low-Key Leaders

--- Observant

--- Empathetic Listeners

--- Intrinsically Motivated

--- Value-Driven

--- Quietly Confident

--- Adaptable

--- Resilient

--- Depth-Seeker

--- Self-Reflective

--- Resourceful

--- Mysterious Aura

-- Downsides of the Sigma

--- Perceived as Aloof

--- Overthinking

--- Hard to Open Up

--- High Self-Standards

--- Reluctance to Ask for Help

--- Struggle with Casual Social Settings