Trinity Stitch
a dense, bobbled all-over texture, also called blackberry or bramble stitch, that reads as clusters of small bumps
Trinity stitch, known just as widely as blackberry or bramble stitch, gets its bobbled surface from working three stitches into one and then gathering three back into one, so the stitch count stays constant while little clusters push forward. Work it over a multiple of four. On the cluster rows you alternate two moves across the row: into the first stitch work (knit one, purl one, knit one), turning one stitch into three, then purl the next three stitches together, turning three into one. The plain rows between are simply purled. On the following cluster row the two moves swap places, so the increase falls where the decrease was, which staggers the clusters into the dense bramble pattern rather than stacking them in columns. The name trinity comes from the three-into-one gathering. It is worked entirely with knits and purls, with no cable needle or yarn over, so the only real skill is keeping the three-stitch clusters even. The fabric is thick, warm, and squashy, which suits blankets and cushions but uses noticeably more yarn than a plain stitch for the same area.