Parallelogram symbol
using xelatex (or lualatex):
\documentclass{article}
\usepackage{unicode-math}
\setmathfont{xits-math.otf}
\begin{document}
\[ a ^^^^25b1 b \]
\Large
\[ a ^^^^25b1 b \]
\end{document}
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 \rule
s), a few rules suffice.
Code
\documentclass[varwidth]{standalone}
\usepackage{graphicx,amsmath,amssymb,pgf}
\newcommand*{\parallelogramm}{%
\rlap{\rotatebox{-30}{\rule[.05ex]{.4pt}{.77em}}}%
\kern.04em%
\rlap{\kern.36em\raisebox{0.649519052835em}{\rule{.6em}{.4pt}}}%
\rule{.6em}{.4pt}\kern-.04em%
\rotatebox{-30}{\rule[.05ex]{.4pt}{.77em}}}
\newcommand*{\Parallelogramm}[1][]{%
\pgfpicture\pgfsetroundjoin
\pgftransformxslant{.6}%
\pgfpathrectangle{\pgfpointorigin}{\pgfpoint{.60em}{.65em}}%
\pgfusepath{stroke,#1}%
\endpgfpicture}
\begin{document}
$\square \triangle$%
\parallelogramm
\Parallelogramm
\Parallelogramm[fill]
\end{document}
Output
With PSTricks just for fun as usual!
\documentclass{article}
\usepackage[pdf]{pstricks}
\newcommand\parallelogram[1][2]{%
\psset{unit=#1pt}
\begin{pspicture}(4,3)
\pspolygon(0,0)(3,0)(4,3)(1,3)
\end{pspicture}}
\begin{document}
This is a parallelogram \parallelogram. Is it cool? Yes! How about the bigger one \parallelogram[10]? Is it cooler? Yes!
\end{document}