 Popular significance levels are <0.05 (*), <0.01 (**), and <0.001 (***).On a Touch-Tone telephone keypad, the asterisk (called "star", or less commonly, "palm" or "sextile") is one of the two special keys (the other is the number sign ("pound sign" or "hash", "hex" or, less commonly, "octothorp" or "square")), and is found to the left of the zero.They are used to navigate menus in Touch-Tone systems such as Voice mail, or in Vertical service codes.