It was a strange-looking pair of scissors that my late mum and other senior female relatives used frequently to impart a zig-zag boundary around the pieces of cloth they used to make their dresses.
I later found out that it was called “Pinking Shears”. Apparently it was invented by one Samuel Briskman in 1931 (there are other claims), to help minimise fraying of textile along cut edges. Doubtful initially, I was later convinced that this gadget could let the dressmakers Stop Worrying & Start Living (happily, I think) as they turned fabric into garments.
But I suspect in these days and times, many youngsters would be confounded by an encounter with this vintage but ingenious tool.
By the way, in Penang we called it 马齿剪刀 (horse-teeth scissors)