% NOT-gate SOUTH
\newsavebox{\nots}
\savebox{\nots}(6,10){
\begin{picture}(6,10)
\put(3,10){\line(0,-1){2}}
\put(0,8){\line(1,0){6}}
\put(0,8){\line(3,-5){3}}
\put(3,3){\line(3,5){3}}
\put(3,0){\line(0,1){1.5}}
\put(3,2.25){\circle{1.5}}
\end{picture}
}