VCC stands for "voltage at the common collector." The letter "V" on a circuit stands for the supply voltage. The letters "CC" indicate that the supply voltage is positive or negative. If the charge is positive, its circuit is a Negative-Positive-Negative circuit, and if negative, it is a Positive-Negative-Positive circuit.
VCC is more commonly labelled V+, VS+ or VDD (voltage drain drain). The common collector is responsible for the power coming from the base and the collector, while output is from the emitter-collector circuit. Integrated circuits with bipolar transistors have positive and negative power supplies. The positive supply is called "VCC" while "VEE" is the negative power supply.