What collar device signifies the rank of a Seaman Recruit in the Navy?

The rank of Seaman Recruit in the Navy is represented by the absence of any collar devices. Seaman Recruits are the entry-level position, and they have not yet completed the training or qualifications that would merit the display of rank insignia.

In the Navy's rank insignia system, higher ranks such as Seaman Apprentice or Seaman do have specific devices, like a single chevron for Seaman Apprentice or more for Seaman, but a Seaman Recruit does not wear any symbols on their collar. This lack of insignia indicates that they are still in the process of training and have not attained a rank that necessitates a collar device.