<unk>  is a method used by a healthcare provider to find out about the changes in the thorax or abdomen. It is done by tapping on a surface to determine the underlying structure. It is one of the four methods of clinical examination: inspection (medicine), palpation,<unk>  and  auscultation. It is done with the middle finger of right hand tapping on the middle finger of the left hand, which is positioned with the whole palm on the body.
There are two types of<unk> : direct<unk> , which uses only 1 or two fingers, and indirect<unk> , utilizing the middle/flexor finger. The method was initially used to distinguish between empty and filled barrels of liquor.
There are four different<unk>  sounds:
Sonorous
Hypersonorous
Relatively dull sound
Completely dull sound
The presence of a solid mass underneath the surface will produce a dull sound. Hollow, air-containing structures will lead to a more sonore sound.
Percussion
Pump
Pulse
Concussion
Poop Breath
Torque
Capillary refill
Breath sounds