Which symbol is commonly used to denote air conduction for the left ear?

In audiometric testing, different symbols are used to represent the results of air conduction tests for each ear. The symbol commonly associated with air conduction for the left ear is a "X". This is a standard convention in audiology, where an "X" is used to indicate left ear responses in audiograms, with corresponding symbols for right ear responses, typically represented by a circle or "O".

The use of these symbols allows audiologists to quickly and accurately interpret and record hearing test results, facilitating effective communication about a patient’s hearing status. Understanding these symbols is crucial for anyone involved in hearing assessments, including dispensers and clinicians. Familiarity with this notation aids in ensuring that audiometric results are both clear and unambiguous in clinical settings.