A traditional AAC was way too abstract. My son has no clue that a red octagon means stop. He has no idea what stop even means in that context.

When I travel, I really like looking at the public graphics for no parking, no entry, etc. Some places are basically just text, but others really have great little illustrations that communicate the message without needing words.

For example – I think it was in France or Spain where the No Trespassing sign is an angry little yelling man with his hand up. It would be helpful if more public graphic designs made this much effort.

This is likely the sign you are thinking of: https://en.wikipedia.org/wiki/ISO_7010#/media/File:ISO_7010_...

It often correlates with a publics literary rate. Which is why really international communication apps have photos for groupchats and speech samples.