Neptune was the Roman god of water and the sea. He was often shown carrying a trident, a three-pronged spear. With his mighty trident, he had caused earthquakes and deluges and holds a 3-fold power over heaven, the earth, and hell.
When you see the symbol of the Trident today, it is usually represented by a three-pronged fork symbolizing power and the holy number 3.
The number 3 is one of the most important numbers in our world. It represents the trinity of beginning, middle and end. The creation of our world dividing time into morning, noon, evening, with the past, the present, and the future.