This is an icon because this sign is representing an object. The object it is representing is a kangaroo, and the viewer understands that this kangaroo symbolizes the awareness that they may be crossing. The color yellow also warns the viewer to proceed with caution.
The image of the skull and crossbones is a symbol because it represents something to the viewer. When one thinks of a skull and crossbones, it is almost always associated with death and a warning of danger.
This sign could be an index and an icon. It is considered an icon because the letter “H” represents that there is a hospital nearby. This letter “H” with the blue background has become a worldwide iconic image that is recognized by everyone. It is also an index because it also has a arrow pointing to the direction of the hospital.
