Final answer:
An awl is the tool used for inserting pins to mend bone fractures or guide nails in surgical settings, distinguishing it from scalpels, forceps, and chisels used for other specific purposes.
Step-by-step explanation:
The tool used for inserting sharp pins to reduce a bone fracture or guide a driven nail is called an awl. This surgical instrument is designed to pierce or make holes, especially in tough tissue such as bone during orthopedic surgeries. It is not to be confused with a scalpel, which is a small and extremely sharp bladed instrument used for surgery, dissection, and art. Forceps are tweezer-like tools used to grasp and hold objects, while a chisel is a tool with a straight or bent blade at the end for carving or cutting hard materials such as wood or stone, but not typically used for surgery on bone.