"Visual clues" refers to things we can see that provide hints or information about something. They are visual signs or symbols that help us understand or interpret a situation, object, or message. Full definition
It can really vary a lot and it's more important to use a thermometer or visual clues as opposed to times for something like this. (browneyedbaker.com)
Large parts of it aren't even explained verbally, told only through visual clues in the environment itself. (pcgamer.com)
I find that the little images provide visual clues to the words as well, enabling for different learning styles and triggers. (tes.com)