What collar device represents the rank of O-7 in the Navy?

In the United States Navy, the rank of O-7 is known as a Rear Admiral (Lower Half). The insignia that represents this rank is one five-point silver star. This distinction is an important aspect of military rank and insignia, as it visually communicates a service member's rank and status to others within the Navy and the general public.

Each lower rank uses a specific insignia to signify the rank, and the progression in the number of stars is a well-established convention in military hierarchy. The five-point star itself has historical significance and is universally recognized within and outside the military, making it an effective emblem for indicating rank. Understanding these insignias is crucial for identifying officers within the Navy and can play a role in their interactions in various environments.