Final answer:
The correct term for the coupling of the thumb and two fingers at or near the tips is known as the 'pinch grip'. This movement is enabled by the opposition movement of the thumb, facilitated by the first carpometacarpal joint.
Step-by-step explanation:
The coupling of the thumb and two fingers (often the forefinger and middle finger) at or near the tips is known as the pinch grip. This movement is part of the broader category of hand movements enabling us to grasp and manipulate objects, employing the opposition movement of the thumb toward the fingers of the same hand.
The ability to perform this movement is thanks to the specialized joint called the first carpometacarpal joint, which allows for the thumb's opposition to the fingers, a combination of flexion and abduction. Such grips are used in many everyday tasks, such as writing or picking up small items.