\tikzmath{\t=-0.2;}
\tikzmath{\size=1.1;}
\tikzmath{\xl=-0.75;}
\tikzmath{\xr=0.75;}

\tikzmath{\a=0.5;}
\tikzmath{\ab=0;}
\tikzmath{\abb=1;}

\tikzmath{\aa=-0.5;}
\tikzmath{\aab=1;}
\tikzmath{\aabb=2;}


\coordinate (R1) at ($(\xl,\a*\xl+\ab)$);
\coordinate (R2) at ($(0,\ab)$);
\coordinate (R3) at ($(\xr,\a*\xr+\ab)$);

\coordinate (S1) at ($(\xl,\a*\xl+\abb)$);
\coordinate (S2) at ($(0,\abb)$);
\coordinate (S3) at ($(\xr,\a*\xr+\abb)$);


\coordinate (A) at ($(S2)!0.25!(S3)$);
\coordinate (V1) at (-0.75*\size,0.75*\size);
\coordinate (V2) at ( 0.5*\size,0.5*\size);

\coordinate (T1) at ($(A)+(V1)$);
\coordinate (T2) at (A);
\coordinate (T3) at ($(A)-1.5*(V1)$);


\coordinate (C) at ($(A)-(V1)$);
\coordinate (B) at ($(A)+(V1)$);
\coordinate (D) at ($(B)-(V2)$);
\coordinate (E) at (0,-\size);

\coordinate (U1) at (D);
\coordinate (U2) at ($(D)-2*(V1)$);
\coordinate (U3) at ($(D)-2*(V1)$);

\coordinate (Txt) at (0.5*\size,-1.25*\size);

\coordinate (Delta) at (3.0*\size,0);

\tikzstyle{A}=[anchor=south]
\tikzstyle{B}=[anchor=south]
\tikzstyle{C}=[anchor=north]
\tikzstyle{D}=[anchor=south]
\tikzstyle{E}=[anchor=north]

\tikzstyle{Txt}=[font={\small}]
