/NUMBER, NKEY
Specifies whether numbers, colors, or both are used for displays.
NKEYNumbering style:
0  | —  | Color (terminal dependent) the numbered items and show numbers.  | 
1  | —  | Color the numbered items. Do not show the numbers.  | 
2  | —  | Show the numbers. Do not color the items.  | 
-1  | —  | Do not color the items or show the numbers. For contour plots, the resulting display will vary (see below).  | 
Specifies whether numbers, colors, or both are used for numbering displays [/PNUM] of nodes, elements, keypoints, lines, areas, and volumes.
Shading is also available for terminals configured with more than 4 color planes [/SHOW]. Color automatically appears for certain items and may be manually controlled (off or on) for other items.
When you suppress color (NKEY = -1) your
contour plots will produce different results, depending on your graphics equipment.
For non-3-D devices (X11, Win32, etc.) your contour plot will be white (no
color). For 3-D devices, such as OpenGL, the resulting display will be in
color. 
The following items are automatically given discrete colors: Boundary condition symbols [/PBC], curves on graph displays, and distorted geometry on postprocessing displays. Contour lines in postprocessing displays are automatically colored based upon a continuous, rather than a discrete, spectrum so that red is associated with the highest contour value. On terminals with raster capability [/SHOW], the area between contour lines is filled with the color of the higher contour.
Explicit entity colors or the discrete color mapping may be changed with the /COLOR command.
This command is valid in any processor.