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A triangle with a small circle at its point, inverting the input.
Also known as: Inverter symbol, Logical NOT gate, Bubble inverter
A NOT gate inverts its input, and the inversion is carried entirely by the small circle at the output rather than by the triangle. The same circle turns AND into NAND and OR into NOR, so recognising it is worth more than memorising any one gate.
Denotes an inverter: the output is the opposite of the input.
Contexts: Technical drawing, Electrical equipment
Carries its meaning in the small circle at the output, which marks inversion on any gate and turns AND into NAND and OR into NOR.
Contexts: Technical drawing, Electrical equipment
Is drawn in the IEC convention as a rectangle marked with a one and a small triangle or circle on the output.
Contexts: Technical drawing, Electrical equipment
A triangle lying on its side with its point to the right, followed immediately by a small hollow circle touching the point.