Central Double Decrease (CDD)
Central double decrease (CDD) reduces three stitches to one in a single step, typically used at the center top of hats and in lace patterns.
Explanation
Central double decrease (CDD) reduces three stitches to one in a single step, resulting in a stitch that sits straight and symmetrically on top, unlike decreasing twice in a row. You slip two stitches together as if to knit them together, knit the next stitch, then pass the two slipped stitches over. The technique is often used at the very center top of a hat to create a neat, symmetrical crown, and is also common in lace and leaf motifs.