Sigma

The typical male hierarchy

From Urban Dictionary:

A more internally-focused sibling to the alpha male. While the alpha male quantifies himself on his high position in the social hierarchy, a sigma male prefers to forego the social hierarchy and need for external validation altogether and pursue internal strength instead. Essentially a "loner" or a stray man, although sigma males may have a close circle of friends and loved ones with whom they share a deep connection. The sigma male is not socially inept but simply socially disinterested. Prefers solitary activities where he doesn't have to play social politics and can simply focus on himself. The sigma male accepts that he does not need power over others as the alpha male desires, but rather needs only power to control himself and preserve his own autonomy from others. Sigma males are often pragmatic but may be seen by others as aloof, paranoid, secretive or selfish.

A sigma is essentially an individual who chooses to ignore society's expectations and validation, in favor of their own objectives and goals outside of the social hierarchy. In schizo male hierarchies, there are different types of males on a pyramid, with Alphas typically at the Apex, and betas at the bottom, for example.

Usage

In the typical usage on this wiki and in the Dom's Fat community, the word sigma has become overused and typically refers to any male which exhibits lone wolf or individualistic characteristics, however it is often extended to people who do not fit these characteristics and can be used as a positive adjective.