Computer Graphics Metafile
Computer Graphics Metafile (CGM) is a free and open international standard file format for 2D vector graphics, raster graphics, and text, and is defined by ISO/IEC 8632. == Overview == All graphical elements can be specified in a textual source file that can be compiled into a binary file or one of two text representations.
Source: Wikipedia — Computer Graphics Metafile (CC BY-SA 4.0)