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“aniconic”
aniconic (adjective)
A description of things that are symbolic or suggestive rather than representative: "Aniconic objects of worship or veneration in primitive religions; such as, trees and rocks were symbolic of gods without being actual images of them."
"An aniconic reference to the worship of an object that is symbolized, but not representing a god or a deity."
"Some religions have an aniconic opposition to the use or presentation of icons or idols."