Answer: graphic aids
What are graphic aids?
A graphic aid is any aid that helps a reader further understand what they are reading. Graphic aids, in other words, are visual aids.
Examples include "charts, diagrams, graphs, maps, flashcards, posters, pictures, photographs, leaflets, folders, pamphlets, cartoons and comics" (www.brainkart.com).
This means the answer to your question is;
graphic aids