as the 'star' and 'square' keys, respectively. (In practice, the 'square' key is almost invariably replaced by the number sign. and the sextile symbol is the more common choice for the star key.)

The standard also recommends that a tactile identifier be placed on the 5 key to make it easier to use the keypad in low-light conditions or by the visually impaired, as well as multiple alternative methods to implement