∙ The hollow wooden horse by which the Greeks allegedly gained access to Ilium/Troy during the Trojan War.
Noun
∙ A subversive person or device placed within the ranks of the enemy. by extension
∙ A malicious program that is disguised as legitimate software. computing
∙ A seemingly favorable offer designed to trick customers into making exorbitant payments. business
∙ A person, organization, social movement, piece of legislation, or ideology with a negative agenda or evil intentions under the guise of positive values or good intentions. politics