Final answer:
A shank is the smooth part of a bolt, a Higbee is a beveled start to thread, and a Higbee indicator is a notch showing where the Higbee thread starts, all of which are related to threads on fasteners in engineering.
Step-by-step explanation:
The terms shank, Higbee, and Higbee indicator are related to engineering, specifically to threads on screws, nuts, or similarly threaded hardware. A shank is the smooth section of a bolt between the head and the threads, which provides clearance but does not screw into anything. The Higbee is the starting thread of a fastener that has a chamfer or bevel to reduce stress concentrations, and it is designed to help ease the start of the threading process. Lastly, a Higbee indicator is a notch or mark on some types of threads that indicates where the Higbee (lead) thread begins or ends, allowing for easier alignment of mating parts.