Wiktionary
n. 1 The conviction that artists should not depict human beings. 2 The conviction that artists should not depict religious figures such as divinities or prophets.
Wikipedia
Aniconism is the absence of material representations of the natural and supernatural world in various cultures, particularly in the monotheistic Abrahamic religions. It may extend from only God and deities to saint characters, all living beings, and everything that exists. The phenomenon is generally codified by the religious traditions and as such becomes a taboo. When enforced by the physical destruction of images, aniconism becomes iconoclasm. The word itself derives from Greek εικων 'image' with the negative prefix an- (Greek privative alpha) and the suffix - ism (Greek -ισμος).