Which collar device represents a Rear Admiral in the Navy?

The identification of a Rear Admiral in the Navy is specifically represented by two silver five-pointed stars. This insignia is a clear symbol of the rank and is consistently used across various naval uniforms to signify the position of Rear Admiral, which is an important flag officer rank. The use of two stars differentiates it from lower ranks and provides an immediate visual representation of the officer's status within the Navy hierarchy.

Understanding insignia is crucial for recognizing ranks, and in this case, two silver stars effectively denote the rank while maintaining a standard across the service. Other options, with different numbers and arrangements of stars or stripes, correspond to other ranks and positions, which is integral to the organization and command structure of the Navy.