- 
        geometry management 
      
- 
        The process whereby a composite controls the geometrical properties of
        its child contacts; the composite is referred to as the geometry
        manager. 
      
- 
        glyph 
      
- 
        An image, typically of a character, in a font. 
      
- 
        grab 
      
- 
        Keyboard keys, the keyboard, pointer buttons, the pointer, and the
        server can be grabbed for exclusive use by a client. In
        general, these facilities are not intended to be used by normal
        applications but are intended for various input and window managers to
        implement various styles of user interfaces. 
      
- 
        gcontext 
      
- 
        Shorthand for graphics context. 
      
- 
        graphics context 
      
- 
        Various information for graphics output is stored in a graphics
        context (or gcontext), such as foreground pixel, background pixel,
        line width, clipping region, and so forth. A graphics context can only
        be used with drawables that have the same root and the same depth as
        the graphics context. 
      
- 
        gray scale 
      
- 
        A degenerate case of pseudo color, in which the red, green, and blue
        values in any given colormap entry are equal, thus producing shades of
        gray. The gray values can be changed dynamically.