Something that is iconic is characteristic of an icon — an image, emblem, idol, or hero. Audrey Hepburn was widely admired for her iconic style, her great fashion taste.
Iconic often describes something or someone that is considered symbolic of something else, like spirituality, virtue, or evil and corruption. The iconic Statue of Liberty is a symbol of freedom. Michelangelo's iconic statue of David was supposed to represent anatomical perfection. In the Christianity, the Virgin Mary is an iconic image of purity and closeness to God. A gun is considered an iconic symbol of violence.