Described by Pusey et al. (Radiographics 1986) as central dot with dashed linear patterns along frequency and phase directions. This is a special case of the zipper in readout direction in which there is also a zipper in the phase encoding direction. Explanation given by Pusey et al is confusing: “MR signal may remain centered at the zero line of the frequency encoding axis. In this case, both the side lobes of the sinc function appear in the final image.”