When you do not know the value of a particular number, the most usual symbol used in place of that number is the letter x.
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The PLACE VALUE.
They are used in place of an unknown number or value.
No number is known as the place value number. Rather it is the system of numbering used whereby a particular digit will change its value depending on its position within the number. eg; 200 and 2,000. The 2 in the first number has a value of two hundred while in the second it has a value of two thousands. It depends where in the positional notation the number is that assigns its value.
The 'zero' symbol is used as a place value holder,and it can hold any place.
It is used for positional place value purposes so as for example to show that 203 is larger than 23