This logo is for a Photographer or Photography magazine or could even be for an videography company with an initial of N&S. The logo represent the initial N & S is an abstract way, as the inner square is the most minimalistic way to represent both the initials in the same form as the shape is an N yet also an S, while the square also represent a camera mirror/ sensor / shutter of the camera. The black outer circle is the inside of the camera mount where the shutter is.
If you are interested in this logo you can email contact@chungdha.com or visit http://www.brandcrowd.com/logo-design/details/89040