Final answer:
The technique for exerting pressure on the diaphragm to help a person remove an obstructing foreign body is called the Heimlich maneuver.
Step-by-step explanation:
The technique for exerting pressure on the diaphragm to help a person remove an obstructing foreign body is called the Heimlich maneuver. This is a first-aid procedure that can be used to dislodge an object blocking a person's airway. The Heimlich maneuver involves standing behind the person, placing your hands above their navel, and applying upward pressure to force air and dislodge the obstruction.