What is "supratika"

In Hindu mythology there were three elephants by the name Supratika. The foremost among them is listed as one of the Diggajas, each representing the eight quarters. The Hindu epic Mahabharata describes two more elephants by the same name – a mythical elephant that was an incarnation of a sage, and the one that belonged to Bhagadatta, the king of Pragjyotisha.