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You probably mean bumpmap texture, that are textures you wear over your normal texture to increase depth and shadows in the textures.
Here's a good example of how it changes the original texture: http://forum.toribash.com/showthread.php?t=571840
And here's a tutorial on how to make them: http://forum.toribash.com/showthread.php?t=560526


If you didn't see the difference in the first link I sent, this picture might help:
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