text: In cases where the two opposite wave trains are not the same amplitude, they do not cancel perfectly, so the amplitude of the standing wave at the nodes is not zero but merely a minimum.  This occurs when the reflection at the boundary is imperfect.  This is indicated by a finite standing wave ratio (SWR), the ratio of the amplitude of the wave at the antinode to the amplitude at the node.
  In resonance of a two dimensional surface or membrane, such as a drumhead or vibrating metal plate, the nodes become nodal lines, lines on the surface where the surface is motionless, dividing the surface into separate regions vibrating with opposite phase.  These can be made visible by sprinkling sand on the surface, and the intricate patterns of lines resulting are called Chladni figures.
  In transmission lines a voltage node is a current antinode, and a voltage antinode is a current node.
  Nodes are the points of zero displacement, not the points where two constituent waves intersect.
  Boundary conditions
  Where the nodes occur in relation to the boundary reflecting the waves depends on the end conditions or boundary conditions.  Although there are many types of end conditions, the ends of resonators are usually one of two types that cause total reflection: