'Letter' in the Bible

And in the days of Artaxerxes, Bishlam, Mithredath, Tabeel and the rest of his colleagues wrote to Artaxerxes king of Persia; and the text of the letter was written in Aramaic and translated from Aramaic.

Rehum the commander and Shimshai the scribe wrote a letter against Jerusalem to King Artaxerxes, as follows—

this is the copy of the letter which they sent to him:“To King Artaxerxes: Your servants, the men in the region beyond the River, and now

This is the copy of the letter which Tattenai, the governor of the province beyond the River, and Shethar-bozenai and his colleagues the officials, who were beyond the River, sent to Darius the king.