duodecimal

Eventually, ancient Egyptian astronomers who used the duodecimal counting system, based on 12, divided the day and night into 12 hours each, giving us 24 hours in the day.

Georges Ifrah, a 20th-century French mathematician, proposed that the sexagesimal system grew out of an alternative method of counting known as the duodecimal system, common throughout Asia.

He spent the rest of the war in prison, betrayed by his ignorance of the duodecimal currency.

The numerical system of the Babylonians was sexagesimal and duodecimal, not decimal, and the year consisted of twelve months, not of ten.

He introduced the decimal system to replace the cumbersome duodecimal method of calculation, which up to his time had been used in mathematical astronomy.