NOT — the bubble is the inversion — logic gate symbols

Why this example is worth doing

The most important distinction on the page: the triangle means buffer and the small circle means inversion, and they are two separate pieces of notation that happen to appear together. A triangle without a bubble is a buffer, which does nothing logically. The bubble is what inverts, and it can be placed on an input as easily as an output. Once that separation is clear, every NAND, NOR and inverted-input symbol on the rest of the page reads without further explanation.

Try your own input in the Logic gate symbols. Every gate in both symbol standards, side by side, on a printable one-page chart.