Dual-Tone Multi-Frequency (DTMF ) signaling is a system by which audible tones are used to represent buttons being pressed on a keypad. Frequently referred to in the United States as "touch tone" (after the Touch-Tone trademark used when the transition from pulse dialing to DTMF began), DTMF makes it possible to signal the digits 0-9 as well as the letters "A" through "D" and the symbols "#" and "*". Few telephone keypads include the letters, which are typically used for control signaling by the telephone network.