What does GRADS stand for?

Generalized Remote Access Database Systtm

Metafile

A metafile can refer to two different types of computer files. The first is a file that describes the contents of other files. This type of metafile may contain metadata, which defines a group other files and gives a summary of what data they contain. The second type of metafile is most often used in computer graphics. These files define objects and images using a list of coordinates.