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It is the constant of proportionality.
If two variables are in direct relationship then the ratio of the two variables is known as the constant of proportion between them. In algebraic form, if X and Y are the two variables, then direct proportionality implies that Y = cX and c is the constant of proportionality.
For a direct variation equation the constant MUST be 0. Then the ratio of a pair of values of the two variables is the slope.
The two types of variables are the CONSTANT and CONTROL.
It is simply a ratio between two variables. There is no information on what measures the letters represent, nor whether the ratio is a constant or variable (eg between Celsius and Fahrenheit).