A sigil may have an abstract, pictorial or semi-abstract form. A sigil may have physical or a visual or other existence.
In a post-modern context the businesses may use corporate logos such as the Coca-Cola logo as their sigils and invest them with a comparable degree of prestige or power or else infamy.
By extension a sigil may apply to audial (the sound of a soft drink can opening), verbal ("Coke adds life!") or numeric information or a combination.
Individuals in history who are known to have used sigils include: