止湘珙

Each character does carry separate meanings but put together like '止湘珙' doesn't have obvious common sense meaning, so it looks more like a unique creation. But separately '止' stops, ends at, '湘' mostly stands for a specific region of China - Xiang, '珙' generally used as a beautiful gem/jade type mineral. This can be taken as a distinctive artistic style or meaningful to some degree only by its creator.