Axial node
A node located approximately midlength of a half-wave resonator. Although the node may be somewhat curved or slanted (depending on the resonator design), its general orientation is perpendicular to the stud axis.
The term "axial node" is derived from the fact that an axial resonator will always have a node of this type. Depending on the modeshape, a nonaxial resonator may or may not have an axial node.
Also see axial node curvature.