Rule 905 “Presiding officer” means the person authorized to rule on a claim of privilege in the proceeding in which the claim is made.

When someone in a court case claims that certain information is privileged (meaning they don't have to share it), a specific person has the authority to decide whether that claim is valid. That person is called the "presiding officer."

In most cases, the presiding officer is the judge. However, in other legal proceedings like hearings or depositions, it could be another official who is running that proceeding. The key point is that only the person in charge of that specific proceeding can make the call on privilege claims.