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The capital 'R' that has two vertical lines instead of one like the alphabet letter stands for "all real numbers". If it is a lower case 'r' it would probably be a variable.
it stands for Faith in Jesus Crist
The point of using letters in algebra is that they can stand for any number (or a range of numbers that are, as yet, unspecified). There is no specific letter allocated to a number.
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You use variables to stand for numbers in algebra