The term SCUBA ACCESSORY can be summarized as a MASK, which is a four-letter word. A MASK is an essential piece of equipment for scuba diving, as it covers the diver's face and provides a window to the underwater world. It also helps to protect the diver's eyes, nose, and mouth from the water. The MASK also helps the diver to breathe more easily by providing a seal around the face and allowing air to flow freely.