The term 'SEND MESSAGE' can be solved by the crossword clue 'TELEGRAPH' which has 9 letters. Telegraphs were one of the earliest forms of communication, invented in the 1830s. They allowed people to send messages over long distances using electrical signals. The messages were sent through a series of wires and could be received almost instantaneously. This was a major advancement in communication technology and allowed people to communicate quickly and easily.