Metonym etc

Visual Synecdoche - on thing that represents something else as a whole
e.g - Yellow Taxi in New York

Visual Metonym - A metonym is a word that denotes one thing but refers to a related thing
e.g - Westminster - everyone instantly relates to London

Visual Metaphor - The representation of a person, place, thing, or idea by way of visual image that suggest a particular association of point of similarity.
e.g The Gherkin