Physicists constantly look for symmetries to understand phenomena, yet sometimes it's asymmetry that ends up being revealing. Here the authors demonstrate two types of acoustic monopoles: When excited by a sound wave, the pressure field near a pressure monopole is symmetric, but the air's velocity is not. On the other hand, the velocity field near a velocity monopole is symmetric, but the pressure field is not. It is also possible to construct a hybrid monopole with neither type of symmetry. These results are expected to promote the design of acoustic metamaterials and related applications, such as higher absorption in subwavelength-scale devices.