Pictogram
This is a drawing where simplified images are meant to symbolize real-world things to tell a message.
The most common example are street signs – like the green “walking man” symbol on traffic lights. This is a simplified rendition of a human walking, used to convey the message that now is the moment you should walk across the street.
Why I Looked It Up
Someone was giving a presentation and they had some diagrams showing an application flow. They kept referring to this as a “pictogram.”