base 3 is a positional numeral system with three as its base. It uses 3 different digits for representing numbers. The digits for base 3 could be 0, 1, and 2.
base 6
base 6 is a positional numeral system with six as its base. It uses 6 different digits for representing numbers. The digits for base 6 could be 0, 1, 2, 3, 4, and 5.