(something requiring adjustment from the Gaussian function)
Non-Gaussian (NG) indicates divergence
from the Gaussian function.
The CMB anisotropies, for example are approximately Gaussian, but at
some level of detail, may diverge. This is currently expected,
as a consequence of inflation and as an explanation for
the development of gas clouds, galaxy clusters, etc.
This is known as primordial non-Gaussianity.