Articulate: verb to unite by or as if by means of a joint (merriam-webster​)
Articulating Borescopes: Borescopes with a small probe tip which can be bended in different directions to get better views
Four Types of articulations:
  • One-way articulation: bending only to one direction 
  • Two-way articulation: probe bends to two directions, right and left
  • Four-way articulation: probe bends to 4 directions, right and left , up and down
  • Joystick 360 all around articulation: probe is steered by a joystick to bend in 360 degree all directions. The steering can be manual mechanical or driven by an electronic motor
Picture
One-Way articulation
Two-Way Articulation
Four-Way Articulation
Joystick 360 Degree Articulation