Final answer:
The grip position where the thumb does not wrap around the bar is called a Thumbless grip. It's used in certain weightlifting exercises but is less secure than other grips.
Step-by-step explanation:
The grip position in which the thumb does not wrap around the bar is known as a Thumbless grip. This grip is sometimes used in weightlifting or bodybuilding exercises and is distinct because the thumb is placed alongside the fingers rather than wrapped around the bar.
It can reduce the pressure on the thumb and is thought to increase the use of the forearm muscles. However, it is also considered to be less secure, and therefore, it is important to practice caution when using this grip method to avoid the bar slipping.
The other options, such as the Hook grip, involve wrapping the thumb, whereas the Pronated grip refers to having the palms facing downward, and the Crossed grip would refer to arms crossed to hold the bar, none of which correctly describe a grip where the thumb does not wrap around the bar.