What does 2 Kings 10:8 mean?

A messenger came and told Jehu, 'They’ve delivered the heads of Ahab’s sons.' Jehu said, 'Pile them up in two heaps at the city gate and leave them there until morning.' 2 Kings 10:8 - Modern Text Bible

(Jehu wanted everyone to see the evidence of his purge, making a public statement of his power and the end of Ahab’s line.)