The notation is then said to be in the scale of which ten is the base, or in the denary scale.
The figures used in the Hindu notation might be used to express numbers in any other scale than the denary, provided new symbols were introduced if the base of the scale exceeded ten.
But the system has never spread; and the word " dozen " itself is based on the denary scale.
The Roman system, except for the use of symbols for five, fifty, &c., is also in the denary scale, though expressed in a different way.
Similarly the number which in the denary scale is 215 would in the quaternary scale (base 4) be 3113, being equal to 3.4.4.4+ 1.4.4+1.4+3.