Kitman

In Islamic jurisprudence kitmān (كتمان "secrecy, concealment") is a subfield of Ḥiyal (the practice of deception or trickery), consisting of the art of making ambiguous statements, paying lip-service to authority while reserving personal opposition, in a kind of political camouflage or reservatio mentalis. The use of such practices to conceal one's religious affiliation when facing persecution or oppression is known as taqiyya.