Kindly help me to create this Gamma symbol

How do I create this gamma symbol?

A Gamma is an upside down L:

\documentclass{article}
\usepackage{amssymb,graphicx}

\newcommand{\bbGamma}{{\mathpalette\makebbGamma\relax}}
\newcommand{\makebbGamma}[2]{%
  \raisebox{\depth}{\scalebox{1}[-1]{$\mathsurround=0pt#1\mathbb{L}$}}%
}

\begin{document}

$\Gamma\bbGamma \mathrm{L}\mathbb{L}$

\end{document}

enter image description here

  • 4
    I would never guessed that... – manooooh Sep 23 at 16:36
  • 8
    That "trick" would ruin the document for copy/pasting, screen readers, search engines, etc. – YSC Sep 24 at 11:04
  • 10
    @YSC Because copy pasting math works so flawlessly all the other times? – Henri Menke Sep 24 at 11:25
  • 9
    @HenriMenke Are you saying that since some documents containing a Gamma are already un-copiable, we should make all such documents ruined for copy/pasting, screen readers and search engines? egreg's answer displays a really nice trick; anyone which uses it should be aware of its consequences, though. – YSC Sep 24 at 12:05

You could use the package https://ctan.org/pkg/unicode-math and choose a math font. That way you get a concise set of glyphs (as long as the typeface's designer did their job well). You should also consider https://ctan.org/pkg/fontspec for a coherent use of typefaces in math mode and text mode. The following examples generate serif blackboard bold capital gammas.

The following glyphs should all be the same (and they look alike to me).

\documentclass{memoir}
\usepackage{amsmath}

\usepackage{unicode-math}
\setmathfont{Asana Math}

\begin{document}
$\BbbGamma \mathbb{\Gamma} \mathbb{Γ} \symbb{\Gamma} \symbb{Γ} ℾ \symbol{"213E}$
\end{document}

enter image description here


EDIT: You can also apply egreg's solution to another underrated font which blends well with CM and LM, please compare them yourself:

\documentclass[landscape]{memoir}
\usepackage{amsmath}
\usepackage{graphicx,dsfont,amssymb,booktabs}

\newcommand\BbbGamma{\reflectbox{\rotatebox[origin=c]{180}{$\mathds L$}}}
\newcommand\BbbGammaVar{\reflectbox{\rotatebox[origin=c]{180}{$\mathbb L$}}}

\begin{document}
\begin{tabular}{*{16}{>{$}c<{$}} }
    \toprule
    \BbbGamma & \mathds h & \mathds k & \mathds 1 & \mathds A & \mathds B & \mathds C & \mathds D & \mathds E & \mathds F & \mathds G & \mathds H & \mathds I & \mathds J & \mathds K \\
    \Gamma & \text h & \text k & \text 1 & \text A & \text B & \text C & \text D & \text E & \text F & \text G & \text H & \text I & \text J & \text K \\
    \BbbGammaVar & \mathbb h & \mathbb k & \mathbb 1 & \mathbb A & \mathbb B & \mathbb C & \mathbb D & \mathbb E & \mathbb F & \mathbb G & \mathbb H & \mathbb I & \mathbb J & \mathbb K \\
    \midrule
    \mathds L & \mathds M & \mathds N & \mathds O & \mathds P & \mathds Q & \mathds R & \mathds S & \mathds T & \mathds U & \mathds V & \mathds W & \mathds X & \mathds Y & \mathds Z \\
    \text L & \text M & \text N & \text O & \text P & \text Q & \text R & \text S & \text T & \text U & \text V & \text W & \text X & \text Y & \text Z \\ 
    \mathbb L & \mathbb M & \mathbb N & \mathbb O & \mathbb P & \mathbb Q & \mathbb R & \mathbb S & \mathbb T & \mathbb U & \mathbb V & \mathbb W & \mathbb X & \mathbb Y & \mathbb Z \\ 
    \bottomrule
\end{tabular}
\end{document}

Top row: \mathds, middle row: Latin Modern, bottom row: \mathbb. enter image description here

  • 3
    +1. With unicode-math, you can also write \BbbGamma or \symbb{\Gamma}. You can additionally use \setmathfont[range={bb, bbit}, Scale=MatchUppercase]{...} to use your double-struck alphabet of choice, including any TrueType or OpenType font. – Davislor Sep 23 at 17:25
  • @Davislor Indeed, RTFM (read the fine manual) is beneficiary. The new options the engines LuaTeX and XeTeX offer are astounding. – CampanIgnis Sep 23 at 17:29

WARNING: Some long time ago there was some package for this, I do not remember the details. I guess it was somehow related to this thingy. And I cannot really tell you why this was dropped, perhaps this discussion helps you.

Anyway, I kept excerpts of this on my machine and usually do something like this

\documentclass{article}
\newcommand{\bbfamily}{\fontencoding{U}\fontfamily{bbold}\selectfont}
\DeclareMathAlphabet{\mathbb}{U}{bbold}{m}{n}
\DeclareSymbolFont{bbold}{U}{bbold}{m}{n}
\SetSymbolFont{bbold}{bold}{U}{bbold}{m}{n}
\DeclareMathSymbol{\bbGamma}{\mathord}{bbold}{'000}
\DeclareMathSymbol{\bbDelta}{\mathord}{bbold}{'001}
\DeclareMathSymbol{\bbVarTheta}{\mathord}{bbold}{'002}
\DeclareMathSymbol{\bbLambda}{\mathord}{bbold}{'003}
\DeclareMathSymbol{\bbTheta}{\mathord}{bbold}{'004}
\DeclareMathSymbol{\bbPi}{\mathord}{bbold}{'005}
\DeclareMathSymbol{\bbSigma}{\mathord}{bbold}{'006}
\DeclareMathSymbol{\bbUpsilon}{\mathord}{bbold}{'007}
\DeclareMathSymbol{\bbPhi}{\mathord}{bbold}{'010}
\DeclareMathSymbol{\bbPsi}{\mathord}{bbold}{'011}
\DeclareMathSymbol{\bbOmega}{\mathord}{bbold}{'012}
\DeclareMathSymbol{\bbalpha}{\mathord}{bbold}{"0B}
\DeclareMathSymbol{\bbbeta}{\mathord}{bbold}{"0C}
\DeclareMathSymbol{\bbgamma}{\mathord}{bbold}{"0D}
\DeclareMathSymbol{\bbdelta}{\mathord}{bbold}{"0E}
\DeclareMathSymbol{\bbespilon}{\mathord}{bbold}{"0F}
\DeclareMathSymbol{\bbzeta}{\mathord}{bbold}{"10}
\DeclareMathSymbol{\bbeta}{\mathord}{bbold}{"11}
\DeclareMathSymbol{\bbtheta}{\mathord}{bbold}{"12}
\DeclareMathSymbol{\bbiota}{\mathord}{bbold}{"13}
\DeclareMathSymbol{\bbkappa}{\mathord}{bbold}{"14}
\DeclareMathSymbol{\bblambda}{\mathord}{bbold}{"15}
\DeclareMathSymbol{\bbmu}{\mathord}{bbold}{"16}
\DeclareMathSymbol{\bbnu}{\mathord}{bbold}{"17}
\DeclareMathSymbol{\bbxi}{\mathord}{bbold}{"18}
\DeclareMathSymbol{\bbpi}{\mathord}{bbold}{"19}
\DeclareMathSymbol{\bbrho}{\mathord}{bbold}{"1A}
\DeclareMathSymbol{\bbsigma}{\mathord}{bbold}{"1B}
\DeclareMathSymbol{\bbtau}{\mathord}{bbold}{"1C}
\DeclareMathSymbol{\bbupsilon}{\mathord}{bbold}{"1D}
\DeclareMathSymbol{\bbphi}{\mathord}{bbold}{"1E}
\DeclareMathSymbol{\bbchi}{\mathord}{bbold}{"1F}
\DeclareMathSymbol{\bbpsi}{\mathord}{bbold}{"20}
\DeclareMathSymbol{\bbomega}{\mathord}{bbold}{"7F}
\DeclareMathSymbol{\bbell}{\mathord}{bbold}{"40}
\newcommand{\BBsymbol}[1]{%
\ifcat#1a\mathbbm{#1}\else
    \ifx#1\Gamma\bbGamma\fi
    \ifx#1\Delta\bbDelta\fi
    \ifx#1\VarTheta\bbVarTheta\fi
    \ifx#1\Lambda\bbLambda\fi
    \ifx#1\Theta\bbTheta\fi
    \ifx#1\Pi\bbPi\fi
    \ifx#1\Sigma\bbSigma\fi
    \ifx#1\Upsilon\bbUpsilon\fi
    \ifx#1\Phi\bbPhi\fi
    \ifx#1\Psi\bbPsi\fi
    \ifx#1\Omega\bbOmega\fi
    \ifx#1\alpha\bbalpha\fi
    \ifx#1\beta\bbbeta\fi
    \ifx#1\gamma\bbgamma\fi
    \ifx#1\delta\bbdelta\fi
    \ifx#1\espilon\bbespilon\fi
    \ifx#1\zeta\bbzeta\fi
    \ifx#1\eta\bbeta\fi
    \ifx#1\theta\bbtheta\fi
    \ifx#1\iota\bbiota\fi
    \ifx#1\kappa\bbkappa\fi
    \ifx#1\lambda\bblambda\fi
    \ifx#1\mu\bbmu\fi
    \ifx#1\nu\bbnu\fi
    \ifx#1\xi\bbxi\fi
    \ifx#1\pi\bbpi\fi
    \ifx#1\rho\bbrho\fi
    \ifx#1\sigma\bbsigma\fi
    \ifx#1\tau\bbtau\fi
    \ifx#1\upsilon\bbupsilon\fi
    \ifx#1\phi\bbphi\fi
    \ifx#1\chi\bbchi\fi
    \ifx#1\psi\bbpsi\fi
    \ifx#1\omega\bbomega\fi
    \ifx#1\ell\bbell\fi
\fi
}

\begin{document}
$\BBsymbol{\Gamma}\BBsymbol{\alpha}$
\end{document}

enter image description here

And of course the outcome is not as nice as in egreg's answer but here you have double stroke letters for all Greek letters. (And those who feel like they need to shout at me: this post starts with a big disclaimer... ;-)

  • Just to add: I really do not know why there is no standard package for this, which also provides a non-pixelated versions of the \mathbbm{C} letters which come with the bbm package. By "I really do not know" whether these are legal or technical issues, or nobody feels if this something good to have. At least I would think this would be something good to have, and would be happy to spend some time to make this work. However, I have no idea how to design a font, and perhaps more importantly I do not know anything about the legal issues. – marmot Sep 23 at 16:45
  • If you want to keep compatibility with other packages, unicode-math uses the macros \BbbGamma, etc. – Davislor Sep 23 at 17:28
  • @Davislor I stressed that I do not know why the package has been changed. (However, I would also not really recommend using unicode-math, but I kindly like to ask you not to start a discussion on this because there are simply different opinions and I am not sure we will find an agreement.) Anyway, thanks for the comment! I am sure that there are pitfalls and reasons why the old package has disappeared (yet I am using the above without problems in many documents). – marmot Sep 23 at 17:31
  • 1
    I agree that this isn't the time or place for that discussion. I simply was noting that, if you use the same command names as other packages, it eases copy-paste and migration. – Davislor Sep 23 at 17:52
  • @marmot I would like to hear why you do not recommend unicode-math (generally?). I would like to learn from a experienced TeXnician of good reputation like you. I do not want to misuse this command section for a discussion, so is there a blog (or something similar) you might refer to? – CampanIgnis Sep 24 at 8:53

I recommend unicode-math for new documents, as CampanIgnis already posted. There are several different packages that support double-struck blackboard-bold Greek letters for legacy NFSS, including:

\documentclass[varwidth, preview]{standalone}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[bbgreekl]{mathbbol}

\begin{document}
\( \mathbb{\Gamma} \)
\end{document}

Other packages including these symbols are stix and mbboard.

this works as well:

\documentclass{standalone}

\newcommand\mygamma{$\mathrm{I} \hspace{-0.4ex} \Gamma$}

\begin{document}

\tiny \mygamma
\small \mygamma
\normalsize \mygamma
\large \mygamma
\Large \mygamma
\Huge \mygamma

\end{document}

produces this result:

Gamma

it works also with other letters, e.g. R or N (real or natural numbers):

\newcommand\myr{$\mathrm{I} \hspace{-0.4ex} \mathrm{R}$}
\newcommand\myn{$\mathrm{I} \hspace{-0.4ex} \mathrm{N}$}

R and N

I also like the contour package

\documentclass[a4paper,12pt]{article}
\usepackage[outline]{contour}
\newcommand*{\fancy}[1]{\color{white}\contour{black}{#1}}
\begin{document}
\fancy{$\Gamma$}
\end{document}

enter image description here

  • One of a nice suggestion, and thanks... – MadyYuvi Sep 26 at 12:34

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