It's called the Binary system.
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Digits or decimal digits more specifically. The decimal system has 10 unique digits 0-9.
It is based on ten digits and the concept of place value.
Binary means base 2 - it uses two digits. Those digits are zero and one.
-- The decimal system (base-10) uses 10 digits to write all numbers. -- The binary system (base-2) uses 2 digits to write all numbers.
0 and 1