  Using first-principles calculation and symmetry analysis, we propose that
\theta-TaN is a topological semimetal having a new type of point nodes, i.e.,
triply degenerate nodal points. Each node is a band crossing between degenerate
and non-degenerate bands along the high-symmetry line in the Brillouin zone,
and is protected by crystalline symmetries. Such new type of nodes will always
generate singular touching points between different Fermi surfaces and 3D spin
texture around them. Breaking the crystalline symmetry by external magnetic
field or strain leads to various of topological phases. By studying the Landau
levels under a small field along $c$-axis, we demonstrate that the system has a
new quantum anomaly that we call "helical anomaly".
