Symbols
There are three symbols for NAND gates: the 'distinctive' (MIL/ANSI) symbol and the 'rectangular' IEC symbol, as well as a deprecated DIN symbol sometimes found on old schematics. For more information see logic gate symbols.
| MIL/ANSI Symbol | IEC Symbol | DIN Symbol |
Read more about this topic: Negated AND Gate
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—Ralph Waldo Emerson (1803–1882)