Not an Activity
A no-sign says only what may not happen, never what the child should do instead. That empty space is hard to fill alone. The pictures below pair the stop with a clear alternative to move on to.
Not allowed
A crossed-out symbol with a red X over a play figure, showing that the activity is not allowed.
About this visual support
A stop without direction leaves the child hanging. The symbol for a ban, the red line or the raised hand, states clearly what may not happen, but says nothing about the way forward. What remains is a child who knows something is wrong but not what to do instead, and that gap easily breeds frustration on both sides.
Visual support works best when the stop has company. When the picture of what is not allowed sits beside a picture of a clear alternative, the message becomes whole: not this, but this is fine. The boundary then becomes understandable rather than just a closed door.
One concrete tip is to always place an alternative picture right after the stop picture, such as a calm activity or a different place, so the child has somewhere to turn. A no then becomes a signpost rather than a dead end. In the Routined app you can link stop and alternative into a pair that clearly belong together.