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An AND gate with an inverting circle on its output.
Also known as: Inverted AND gate, Logical NAND gate
A NAND gate is an AND gate with the output inverted, giving a zero only when every input is a one. Almost all digital logic is manufactured from NAND gates because every other function can be built from them, which is a fact about the silicon rather than about the drawing.
Denotes an inverted AND gate: the output is false only when every input is true.
Contexts: Technical drawing, Electrical equipment
Is functionally complete, meaning every other logic function can be built from NAND gates alone, which is why they dominate integrated logic families.
Contexts: Technical drawing, Electrical equipment
A flat-backed shape with a semicircular front followed by a small hollow circle at the output.