role

 role  is an h-card property (marked up usually as "p-role") that can be used on a homepage to provide a summary of what that person does and/or how they perceive themselves, often providing a summary of what they post about.

Why
A role is a brief way of introducing yourself, should reflect the things you post about, and thus is a good opportunity to provide readers of your website a personal summary of what is it that you do in general.

How
Use the  property to markup your role inside your h-card on your homepage

Tantek
undefined has had a role at the top of his homepage just underneath his name since ~2010(?).