36 CFR Part 1194 - Proposed Information and Communication Technology (ICT) Standards and Guidelines NPRM
407.3.3 Numeric Keys.
Where provided, numeric keys shall be arranged in a 12-key ascending or descending keypad layout. The number five key shall be tactilely distinct from the other keys.
Advisory 407.3.3 Numeric Keys. A telephone keypad and a keypad on a computer keyboard differ in one significant feature, ascending versus descending numerical order of the layout. Some keypads will have a double width zero key and decimal key instead of the asterisk and pound signs found on a telephone keypad. These examples conform to this provision.
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