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The graph tool understands seven constants.
e ~ 2.718281828
pi ~ 3.141592654
These constants can be used in functions, axes, domains, points and vectors.
Variable constants (now there is an interesting concept - they probably should be called parameters) allow you to examine how changing numbers in a function affects the function's shape.
The graph tool reserves a, b, c, d and m as constants that can be included in functions. They are entered in the same way as the variables x, y, r, t and th.
For example, you can enter the following function
y = ax2 + bx + c
and examine how changing a, b and c affects the parabola.