The symbol of a snake representing a traitor likely dates back to ancient times, when snakes were thought to have negative connotations due to their cunning, sly and manipulative behaviour. Snakes often slither silently, move swiftly and can hide away quickly, which is associated with sneaking and sneaking around, making it an apt symbol of deception and untrustworthiness. Additionally, many stories have depicted the serpent as a figure of betrayal and treachery, like in the bible when the serpent was the one responsible for leading Adam and Eve to disobedience and original sin. Thus, snakes became a common metaphor for deviousness, ultimately representing someone who is a traitor and should not be trusted.