special logic gate

Question

How would one go about drawing a logic gate like this one ?

Answer 1

With circuitikz:

\documentclass{article}
\usepackage{circuitikz}
\begin{document}
\begin{circuitikz}
  \node[american not port] {};
\end{circuitikz}
\end{document}

With the TikZ circuits.logic library:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{
  circuits.logic,
  circuits.logic.US
}
\begin{document}
\begin{tikzpicture}[circuit logic US]
  \node[not gate] (n) {};
  \draw (n.input) -- +(-.1,0);
  \draw (n.output) -- +(.1,0);
\end{tikzpicture}
\end{document}