documentclass[preview,border=10pt]{standalone}
usepackage{tikz}

newcommand{cornerur}{%
begin{tikzpicture}%
draw[line width=.4mm] (0,0) -- (0,2ex);%
draw[line width=.4mm] (0,0) -- (2ex,0);%
end{tikzpicture}%
}


newcommand{cornerul}{%
begin{tikzpicture}%
draw[line width=.4mm] (2ex,2ex) -- (2ex,0);%
draw[line width=.4mm] (0,0) -- (2ex,0);%
end{tikzpicture}%
}

newcommand{cornerdr}{%
begin{tikzpicture}%
draw[line width=.4mm] (0,0) -- (0,2ex);%
draw[line width=.4mm] (2ex,2ex) -- (0,2ex);%
end{tikzpicture}%
}

newcommand{cornerdl}{%
begin{tikzpicture}%
draw[line width=.4mm] (0,2ex) -- (2ex,2ex);%
draw[line width=.4mm] (2ex,0) -- (2ex,2ex);%
end{tikzpicture}%
}

newcommand{horiz}{%
begin{tikzpicture}%
node at (0,0) {}; {}%
draw[line width=.4mm] (0,.5ex) -- (2ex,.5ex);%
end{tikzpicture}%
}

newcommand{vertic}{%
begin{tikzpicture}%
draw[line width=.4mm] (.5ex,0) -- (.5ex,2ex);%
end{tikzpicture}%
}

begin{document}
[
renewcommand{arraystretch}{1.5}
begin{tabular}{ | c | c | }
  hline
    $cornerdr$ & $ horiz $\
  hline
   $vertic$ & $cornerdr$ \
  hline
end{tabular}
qquad
begin{tabular}{ | c | }
  hline
   $cornerdr$ \
  hline
   $ cornerul $\
  hline
end{tabular}
]
end{document}