What symbol represents unmasked air conduction for the right ear?

The symbol that represents unmasked air conduction for the right ear is the letter O. In audiometry, different symbols are used to denote various types of hearing measurement, and for air conduction testing, the right ear is specifically designated with an O. This is a standard convention in audiological practice, where an O indicates that the measurement is taken without masking, meaning that the assessment is directly reflecting the hearing capability of the right ear alone.

Using this system, the left ear is represented by an X, which helps to distinguish the results for each ear on an audiogram clearly. The other symbols, < and >, are used for bone conduction testing, with < indicating the right ear and > indicating the left ear. Understanding these symbols is crucial for accurately interpreting audiograms and ensuring proper hearing evaluations.