When a symbol is used for a number it could be any symbol at all. It could be a letter from the Roman or Greek alphabet, upper case or lower case. It could also be any random symbol that you like provided that it is not a "reserved" symbol. By that I mean you cannot use "+" as a symbol since that might be very confusing!
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it is any letter or mathematical symbol that represent a number or a set of number
The greater than symbol is typically a mathematical symbol declaring that one given value or number is greater than another given value or number. One would use this symbol for certain mathematical applications, as well as to indicate in any circumstance that one things value is greater than another.
Q is the set of all rational numbers. The letter Q is used because rationals can be expressed as a quotient of two integers. Any letter from the Greek or Latin alphabet may be used as a symbol for an individual rational number.
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