The symbol for an inverter is that of a buffer with an inversion bubble at the output.

The inversion bubble is a schematic symbol that's used in conjunction with logic gates that indicates the signal at that point is inverted. Inversion bubbles can be found on inputs, outputs, or both.

DeMorgan's Law

Main article: DeMorgan's Law

As a consequence of DeMorgan's Law, one can often move the inversion bubble around in order to optimize a circuit. The ability to generate equivalent networks is very important in naturally inverting technologies such as CMOS because it eliminates redundant inversions.

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