'Letters' in the Bible

Meanwhile, Ahab had 70 sons who lived in Samaria. So Jehu wrote letters and sent them to Samaria to the rulers of Jezreel, the elders, and the guardians of Ahab's children. He told them,

Some time later, Berodach-baladan, the son of King Baladan of Babylon, sent letters and a gift to Hezekiah, because he had heard that Hezekiah had been ill.