# \Theta with square

I'm using \Theta for some concept in my work, then I need a variation of such concept. I was thinking to use \Theta symbol with a square instead of a circle.

How can I obtain such symbol?

Thanks

• Would \boxminus be ok? You need to load amssymb to use it. – Philipp Oct 2 '13 at 5:30
• I don't think those symbols would be that distinguishable. Why not use an alternative symbol? Or perhaps \Theta'? – Werner Oct 2 '13 at 5:49
• You can try to use a reverse search like detexify. No much luck there, the best was \boxminus from amssymb package. You can also try to include a previously made image, but it can be a pain to use. – masu Oct 2 '13 at 6:13
• How about \Xi? – Werner Oct 2 '13 at 6:16
• How about \varTheta? – Francis Oct 2 '13 at 6:39

A solution with TikZ:

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{calc}

\newlength\thetawidth
\newlength\thetaheight

\newcommand*{\SquareTheta}{%
\begingroup
\setlength{\mathsurround}{0pt}%
\settowidth{\thetawidth}{$\Theta$}%
\settoheight{\thetaheight}{$\Theta$}%
\begin{tikzpicture}[
x=\thetawidth,
y=\thetaheight,
]
\draw[line width=.1\thetawidth, line cap=round]
(0.125,.05\thetawidth) -- +($(0,1)-(0,.1\thetawidth)$)
(0.875,.05\thetawidth) -- +($(0,1)-(0,.1\thetawidth)$);
\draw[line width=.05\thetaheight, line cap=butt]
(0.125,.025\thetaheight) -- +(0.75,0)
($(0.125,1)-(0,.025\thetaheight)$) -- +(0.75,0);
\draw[line width=.1\thetawidth, line cap=butt]
(0.275,0.5) -- (0.725,0.5);
\draw[line width=.0375\thetaheight, line cap=butt]
($(0.275,0.5)-(0,.1\thetawidth)$) -- +(0,.2\thetawidth)
($(0.725,0.5)-(0,.1\thetawidth)$) -- +(0,.2\thetawidth);
\end{tikzpicture}%
\endgroup
}

\begin{document}
\renewcommand*{\arraystretch}{0}
\begin{tabular}{c}
$\Theta$ \\[1pt]
$\SquareTheta$ \\[1pt]
$\Theta\SquareTheta$
\end{tabular}
\end{document}