What is the name of the pink stich?

The name of the pink stitch is typically referred to as a "pinked edge" or a "pinking stitch." This type of stitch is created using a pinking shears, which have serrated blades that cut fabric in a zigzag pattern to prevent fraying. The pinked edge is commonly used in sewing to finish seams or edges of fabric, providing both a decorative touch and preventing unraveling.