This is the traditional festive head gear worn by Bajau women. The Bajau, a formerly nomadic people now mostly home to Malaysia, Indonesia and the Philippines, live by and from the sea and have recently gained recognition for a genetic trait that allows them to dive deeper and for longer time stretches than any other ethnic group. They are often referred to as Sea People and this traditional head gear seems to symbolize this. I could not find any interpretation of the shape, but they appear to me like ships or tail fins of sea mammals or mermaids – or all three.