2 u2032 d in the diagrams a cross u201c x u201d means that an upper surface side warp u u u2032 u u2033 lies over an upper surface side weft to form a knuckle on the upper surface side while an open square u201c u25a1 u201d indicates that a lower surface side warp d lies under a lower surface side weft to form a knuckle on the lower surface side a solid circle u201c u25cf u201d indicates that a warp binding yarn b lies under an upper surface side weft to form a knuckle while an open circle u201c u25ef u201d indicates that a warp binding yarn b lies under a lower surface side weft to form a knuckle a solid rhombus u201c u2666 u201d indicates that a warp binding yarn b lies over an upper surface side weft to form a knuckle an open rhombus u201c u22c4 u201d indicates that a warp binding yarn b lies under a lower surface side weft to form a knuckle a thick frame in the design diagrams indicates a portion where the knuckles of the warp binding yarn are aligned with the knuckles of the upper surface side warp and a mesh indicates a portion where the knuckles are absent in fig9 to 18 in the design drawings the lower surface side warps and wefts lie directly underneath the upper surface side warps and wefts respectively this is for the convenience of the drawings and.