Final answer:
A Torx screw is a specialty fastener commonly used in vehicles to secure mirrors, headlight assemblies, and racks due to its ability to provide a strong grip and higher torque transfer.
Step-by-step explanation:
The specialty fastener often used to secure mirrors, headlight assemblies, and racks in automotive applications is a Torx screw.
Torx screws are recognizable by their six-pointed star-shaped pattern, which provides a better grip and higher torque transfer compared to traditional screws such as Phillips or flathead. This makes them particularly suitable for applications that require a strong and secure fastening. They are often used in vehicles for parts that need to be securely mounted yet easily removable for repairs or replacements.