Which device indicates an E-3 in the Navy?

The device that indicates an E-3 in the Navy is three diagonal stripes. This insignia is worn on the uniform and signifies the rank of Seaman or Airman, among other ratings that fall under the E-3 pay grade.

In the Navy's rank structure, each level is distinctly marked with specific insignia that represents the service member's position and rank. For example, the E-1 rank has no stripes, the E-2 rank has one stripe, and then the E-3 rank uniquely features three diagonal stripes. This progression visually communicates the sailor's level of experience and responsibility within the Navy, allowing for quick recognition by peers and superiors.