Lignum nephriticum cup crafted from narra Wooden (the namesake of the province) made opalescent colors when water is poured into it. These wooden cups were being a major pre-colonial and colonial industry of Naga. Naga could be the indigenous pre-colonial name of town. It is named following the narra https://casper7799888.laowaiblog.com/27635204/what-does-23naga-mean