Sigils are images that represent complex concepts. Images can access and influence aspects of consciousness that ordinary words and text do not. In the context of Chaos Magic, they are personal affirmations encoded into personal symbols and ritually charged and embedded in our sub-conscious to help our future actions bias our behaviour towards the desired goal.
Short, simple, effective intro to Sigil creation
Intro to creating your own sigils with an explanation of the psychology behind their effectiveness.
Grant Morrison, comic book author and visionary talking ( amusingly and eloquently) about how sigils can help us to realise our true selves and our common humanity.