What is a juvenille caution?

One might imagine a warning of potential hazards or risks that in a given product or attraction might be harmful to kids but not to adults- Pg-l3 plus films, size and height requirements on some amusement rides (usually indicated with stick-figure dummies if your as tall as me you can go on this ride- for some reason Dennis the Menace often pressed into service here! again a warning that something is or may be harmful to juveniles, but not necessarily mature adults.