<prompt> Lovibond angle is:Angle between the iris and corneaAngle between the long axis of the forearm and the long axis of upper armAngle between nail bed and proximal nail foldAngle between manubrium sternum and body of sternum  <response>: Lovibond angle or Hyponychial angle - Angle between nail bed and proximal nail fold - Normally around 1600. - It is 1800 in digital clubbing. It is described as a profile sign 