Which of the following is NOT a status symbol?

The choice identified as Circle O stands out as it is typically not recognized as a status symbol in various contexts. Status symbols are often represented by specific shapes or markings that indicate a particular rank, privilege, or level of achievement within a structured environment such as the military. For example, an X or a Circled X might denote certain ranks or specific units, while a Diagonal Slash could signify a form of disqualification or absence of status.

Circle O, on the other hand, generally lacks a commonly understood association with status in comparison to the other symbols listed. Each of the other options has distinctive connotations or uses that relate more directly to rank or recognizable classifications within military culture or training exercises. Therefore, it's important to understand how symbols are used to convey hierarchies or distinctions, which illuminates why Circle O does not align with those meanings.