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It has no value and it is placed there for positional place value purposes.
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unit
The unit digit of a number is the digit in the ones place, which is the integer part of the number. In the case of 12.04, the integer part is 12, and the unit digit is 2. Therefore, the value of the unit digit in 12.04 is 2.
The unit step function at t=0 is defined to have a value of 1.