Which of the following is a type of unusual license plate that may indicate a Sovereign Citizen?

The type of unusual license plate that may indicate a Sovereign Citizen is the diplomat (no country listed) plates. Sovereign Citizens often reject standard governmental authority and legal identification methods, which can lead them to use alternative identification such as plates that appear to be diplomatic but lack the official country designation. These plates are not issued under normal diplomatic conventions, making them suspicious and a potential indication of Sovereign Citizen beliefs.

In contrast, registered diplomat plates and standard state plates are typically legitimate and issued according to traditional government processes, making them less likely to be associated with Sovereign Citizen activities. Commercial vehicle plates are also regulated and do not typically align with the identifying markers or philosophies held by Sovereign Citizens.