How can I create a rectangle symbol?

Question

I need to represent symmetries of a a rectangle as a set, and in my text book they do so by using the following notation

S(SYMBOL-THAT-LOOKS-LIKE-A-RECTANGLE)

I searched everywhere, tried http://detexify.kirelabs.org/classify.html and no luck. So, I came to terms with there not being any rectangle, and the closest I have been able to get is

$s\sqsubset\sqsupset$

Is there any way I can reduce the spacing between them so they make a better rectangle?

Answer 1

This is U+25AD (▭) and available as \hrectangle in unicode-math (if using xelatex or lualatex) or stix if using pdflatex (and will be available in other font packages that cover the Unicode math blocks)

\documentclass{article}

\usepackage{stix}

\begin{document}

$a \hrectangle b $

\end{document}

Answer 2

A good occasion for \ooalign, one of the best tricks in my toolbox:

\documentclass{article}
\usepackage{amssymb}

\newcommand{\rectangle}{{%
  \ooalign{$\sqsubset\mkern3mu$\cr$\mkern3mu\sqsupset$\cr}%
}}

\begin{document}
$S(\rectangle)$
\end{document}

Experiment changing 3mu for different ratios between width and height.

Answer 3

\documentclass[12pt]{report}
\usepackage{amsmath,amssymb}
\newcommand{\rectangle}{\fboxsep0pt\fbox{\rule{1em}{0pt}\rule{0pt}{1ex}}}
\begin{document}
  $s\rectangle$

\end{document}

Answer 4

Try this:

\documentclass{article}
\usepackage{amsmath,amssymb}
\begin{document}
  A$\sqsubset \! \sqsupset$B
\end{document}

Answer 5

One simple method would be to use tikzpackage. You can draw each line of the rectangle. It may be tedious at first to use tikz, but it is so much more convenient when you need to modify your image. \usepackage{tikz} \begin{document}

\maketitle


S
\begin{tikzpicture}[font=\small\sffamily\bfseries, node distance = 0.5cm]
\tikzset{
    mynode/.style={rectangle,rounded corners,draw=black, top color=white, bottom     color=yellow!50,very thick, inner sep=1em, minimum size=3em, text centered},
    myarrow/.style={->, >=latex', shorten >=1pt, thick},
    mylabel/.style={text width=7em, text centered} 
}  
\tikzstyle{block} = [rectangle, draw,  
    text width=11em, text centered]

\tikzstyle{decision} = [diamond, draw, text width=4em, text badly centered, inner     sep=0pt]

\node[block] (rectangle) [text width=13em] {text_inside_rectangle};  
\end{tikzpicture}

Here, I draw a node. you can specify the dimensions of the rectangle accordingly. And if you want more such rectangles you just have to repeat the '\node[block] (rectangle) [text width=13em] {text_inside_rectangle}; ' statement. Hope this helps.