The audio file, titled 'b01', is characterized by the distinct and prominent sound of a bell that is in the process of ringing. This sound is continuous, resonating throughout the audio file. It's clear and sharp, reminiscent of a traditional metallic bell that one might find in a school or a church. The ringing is rhythmic, creating a sense of urgency or a call to attention. This audio file is an encapsulation of a classic and universally recognized sound - the ringing of a bell.