Final answer:
The upside down L shaped arm likely refers to the carrying angle, a 5-15 degree lateral deviation between the arm and forearm, which facilitates the swinging of the arms or carrying objects without interference from the hips.
Step-by-step explanation:
The question about what an upside down L shaped arm means is related to the concept of the carrying angle in anatomy. This angle is formed between the arm and the forearm when the arm is extended and the palms are facing forward. It is called the carrying angle because it allows for the forearm and hand to swing without hitting the hip, especially during the act of carrying objects. The angle typically ranges between 5-15 degrees and is usually more prominent in females due to their generally wider pelvis.
The upside down L shape could alternatively be interpreted as a description of a body position but based on the provided information, it seems to be describing the carrying angle. No direct reference to the 'upside down L shaped arm' is made in standard anatomical terms, but it is essential to understand the normal deviation known as the carrying angle for proper anatomical description.