vcc vdd vss terminology

Community PCB Design
1

I have a circuit that uses a number of rails. Namely 5v, 12v, 3.3v

What is a good way to handle the terminology in Eagle?

From the sparkfun eagle library I have been adding ground, and vcc “components” into my diagram but they don’t differentiate the different voltages… What is standard practice in this area?

2

The supply and sparkfun libraries contain “3.3V” etc symbols, which you should use (plus its more specific). Note that the supply libraries prefix with +, whereas Sparkfun does not (and that does matter when you use both ;)).