CW Procedure Signals
by John Shannon, K3WWP http://home.windstream.net/johnshan/cw_ss_list_proc.html
Perhaps the most important abbreviations in CW operation are the procedure signals. Learn to use them correctly. If the signal is overlined (Internet Explorer, Safari, and Google Chrome - possibly others), it means the two letters (AR AS BT SK for Netscape users) are to be run together as one character. For example AR means send it as di dah di dah dit.