The First-Aid Equipment (ZG1) safety sign has a white cross on the green square shaped safety sign.
 
The sign indicates where first aid equipment or the first aid box can be located and is often used in conjunction with one of the following safety signs:
General Direction
General Direction (Diagonal)
The first-aid equipment safety sign is also available as a Photoluminescent (glow in the dark) sign as a single safety sign or as a combination of more than one safety sign.
Refer to the Photoluminescent section for various combination options. 
This is a SABS standard safety sign