  The Abelian decomposition of QCD tells that there are two types of gluons in
QCD, the color neutral neurons and colored chromons, which behave differently.
This strongly implies that QCD has two types of gluon jets, the neuron jet and
chromon jet. One quarter of the gluon jets is made of the neuron jets which
have sharper jet radius and smaller particle multiplicity, while three quarters
of them are made of chromon jets which have the broader jet radius and larger
particle multiplicity. Moreover, the neuron jet has a distinct color flow which
forms an ideal color dipole pattern, while the chromon jets have distorted
dipole pattern. In this paper we provide five circumferential evidences of the
existence of two types of gluon jets from the existing ALEPH and DELPHI data on
$e \bar e \rightarrow Z \rightarrow b \bar b g$ decay and the CMS data on Pb-Pb
heavy ion collision.
