xxxPin means its a pin?

Forum 2005-2010 (read only) General Frequently-Asked Questions
5

"pinMode" is a function.
Its parameters define a pin number and a mode.
The function is called with these parameters.
Thus "pinMode (13, OUTPUT);" sets pin thirteen to be an output.

If we'd said:
const int ledPin = 13;
..
..
pinMode (ledPin, OUTPUT);

we'd have achieved the same result.