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A microphone that picks up sound equally from two directions. A good example of this type of microphone would be if you were able to put two cardioid microphones back-to-back. The resulting microphone would pick up sound from two directions and reject sound from the sides. It’s common to see such a microphone used for recording or broadcast applications. Typical specifications are: coverage angle=90-degrees (each side), maximum rejection=90-degrees (2-points) Source: Church Audio & Acoustics Glossary