An iconic mental representation WordNet 3.0 & Open English WordNet

In the philosophy of mind, neuroscience, and cognitive science, a mental image is an experience that, on most occasions, significantly resembles the experience of "perceiving" some object, event, or scene but occurs when the relevant object, event, or scene is not actually present to the senses. Wikipedia

A picture in one's mind Wikipedia Disambiguation

representation in an individual's mind of the physical world outside of that individual Wikidata

A representation of visible reality produced by drawing, painting, printing, photography, etc. OmegaWiki

A mental picture of something not real or not present. Wiktionary

Mental picture. Wiktionary (translation)