% NOR-gate NORTH
\newsavebox{\norn}
\savebox{\norn}(6,12){
\begin{picture}(6,12)
\bezier{60}(0,2)(0,7)(3,9)     % western section of pointed curve
\bezier{60}(6,2)(6,7)(3,9)     % eastern section of pointed curve
\bezier{40}(0,2)(3,4)(6,2)     % bottom curve
\put(3,10.5){\line(0,1){1.5}}  % output line
\put(3,9.75){\circle{1.5}}     % bobble
\put(1,0){\line(0,1){2.5}}     % western input line
\put(5,0){\line(0,1){2.5}}     % eastern input line
% NB intersection of input lines & back curve is estimated (not calculated)!
\end{picture}
}