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一般解释
VCC：C=circuit 表示电路的意思, 即接入电路的电压；
VDD：D=device 表示器件的意思, 即器件内部的工作电压；
VSS：S=series 表示公共连接的意思，通常指电路公共接地端电压。
GND：在电路里常被定为电压参考基点。
VEE：负电压供电；场效应管的源极（S）
VPP：编程/擦除电压。
V*与V*A的区别是：数字与模拟的区别
维基百科
下面是维基百科关于电源电源输入的解释
IC power-supply pin
Almost all integrated circuits (ICs) have at least two pins that connect to the power rails of the circuit in which they are installed. These are known as the power-supply pins. However, the labeling of the pins varies by IC family and manufacturer.
| Typical supply pin labeling | ||||
|---|---|---|---|---|
| BJT | FET | |||
| Positive supply voltage | VCC/VBB | VDD | V+ | VS+ |
| Negative supply voltage | VEE | VSS | V− | VS− |
| Ground | GND | GND | 0 | 0 |
The simplest labels are V+ and V−, but internal design and historical traditions have led to a variety of other labels being used. V+ and V− may also refer to the non-inverting (+) and inverting (−) voltage inputs of ICs like op amps.
For power-supplies sometimes one of the supply rails will be referred to as ground (abbreviated “GND”) – positive and negative voltages are relative to the ground. In digital electronics, negative voltages are seldom present, and the ground nearly always is the most negative voltage level. In analog electronics (e.g. an audio power amplifier) the ground can be a voltage level between the most positive and most negative voltage level.
While double subscript notation, where subscripted letters denote the difference between two points, uses similar looking placeholders with subscripts, the double letter supply voltage subscript notation is not directly linked (though it may have been an influencing factor).[1][2]
一位网友的解释
来源：all about circuts
what is Vcc, Vss, Vdd & Vee?
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