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I'd tried Detexify but no success. Since we have \square for quadrilateral and \triangle for triangles, I'd like to use a symbol for parallelogram. A kind of slanted square.

Of course, I can do this using tikz but I guess that it is too much. I'd need to load a huge package only to draw a single symbol.

Any ideas?

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there's a parallelogram at U+25B1 in unicode, so this would be in the stix or xits fonts. (those aren't in either detexify or the comprehensive symbols list yet.) – barbara beeton Oct 8 '13 at 12:19
@barbarabeeton, thanks for your comment but I have no idea how to use this glyph. Is it possible to define a newcommand? – Sigur Oct 8 '13 at 12:22
i'm certain it's possible to define a \newcommand{\parallelogram}, but i haven't ever actually used the stix or xits fonts with (la)tex (even though i helped develop the stix fonts), so this is better answered by someone with real experience. hence a comment rather than an answer. – barbara beeton Oct 8 '13 at 12:27
@barbarabeeton, thanks. I found here stixfonts.org/allGlyphs.html the list of symbols available. As you said, ▰ or ▱ is what I want. – Sigur Oct 8 '13 at 12:33
up vote 11 down vote accepted

using xelatex (or lualatex):

enter image description here




\[ a ^^^^25b1  b \]

\[ a ^^^^25b1  b \]

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David, as far as I know it is possible to use only some glyphs from that font, isn't? So the math font would be still the cmr. Thanks. – Sigur Oct 8 '13 at 16:30
The stix font have recently been repackaged as a set of fonts for classic (pdf) tex. Using xelatex it's simpler (although not strictly required) to go with the flow and use a matching font for everything. – David Carlisle Oct 8 '13 at 16:35
\usepackage{stix} and use \parallelogram is the simplest way to use STIX math fonts, especially for classic pdfTeX. – Leo Liu May 19 '14 at 4:00

You don’t need TikZ, you can use PGF (just a little lighter), or if you don’t need rounded line caps/joins (or if you know how to activate them for \rules), a few rules suffice.


$\square \triangle$%


enter image description here

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Does pgf come with basic installation? – Sigur Oct 8 '13 at 13:03
@Sigur I don’t know. PGF is the basic layer of TikZ (or to be precise: TikZ is the front-end layer of PGF). Both together (And more) are bundled under pgf in TeXLive and MikTeX. – Qrrbrbirlbel Oct 8 '13 at 13:06

With PSTricks just for fun as usual!




This is a parallelogram \parallelogram. Is it cool? Yes! How about the bigger one \parallelogram[10]? Is it cooler? Yes!

enter image description here

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I'd love to kiss your armpit. – Quinn Culver Feb 17 at 0:35

It is not perfect, but the stmaryrd package offers \fatslash and \fatbslash (as binary operators).

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Thanks, but it is not too fat... lol – Sigur Oct 8 '13 at 12:21

This answer uses stackengine and scalerel to construct the glyph. It scales to different math sizes, though the line stroke thickness will be diminished in the process.

$\square \triangle \parallelogram \scriptscriptstyle \square \triangle \parallelogram$

enter image description here

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