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The symbol that represents change is delta. (It looks like a little triangle before the unit) ..../\..... ../....\..... /____\....
A constant like "c" equals the speed of light in E=mc2
The symbol for the operation of absolute value is |n| but I don't know why a common symbol is needed.....
Delta - Its the fourth letter of the Greek alphabet, and it is often used in mathematical expressions to represent the change (i.e. the delta) that occurs to a value.
The change in the input value is equalto the change in the output value.