How to get a fat version of \mathscr{D}?

Question

I'm trying to write a curly/curvy D and it is not \mathcal{D} or even \mathfrak{D}, rather it seems that it is \mathscr{D} I'm looking for, but then when I do write that it is a very thin capital D. I want a fat curvy one, just as shown in the figure below. Anyone know how to get one like that?

Edit: with fat I mean one which is wide with a lot of white space inside it.

Answer 1

Expanding my comment into an answer:

The glyph in question is the math script "D" from the MathTime Professional 2 fonts set:

It also has a bold variant if required:

The script font is not available in the free "Lite" version of the fonts, only in the "Complete" version available for purchase. To my knowledge, a similar symbol in a free font does not exist.

If cost is more of a priority than matching the glyph style exactly, you may be interested in reviewing Christian's excellent answer here for more alternative script fonts. Check the "Calligraphic" section of the image posted in his answer.

Answer 2

If you are willing to use LuaLaTeX:

% arara: lualatex

\documentclass{article}
\usepackage{unicode-math}

\begin{document}
\[\mbfscrD^{(j_1)}_{m^{\phantom{\prime}}_1 m^{\prime}_1}(\mathbf{R})\mbfscrD^{(j_2)}_{m^{\phantom{\prime}}_2 m^{\prime}_2}(\mathbf{R})\]
\setmathfont{xits-math.otf}
\[\mbfscrD^{(j_1)}_{m^{\phantom{\prime}}_1 m^{\prime}_1}(\mathbf{R})\mbfscrD^{(j_2)}_{m^{\phantom{\prime}}_2 m^{\prime}_2}(\mathbf{R})\]
\end{document}

All available symbols of the unicode-math package can be found in its documentation. These are 6 versions of a bold script latin uppercase "D":

Answer 3

You can have real bold calligraphic fonts thanks to Michael Sharpe's packages: dutchcal makes available Elsevier's calligraphic font, boondox makes available the eponymous font in two forms. Finally bickham makes available Adobe's Bickham Script Pro; this one requires some small work from the user: the font is Opentype and has to be converted to type 1 first, with the LCDF Type Tools and more specifically by cfftot1. As the font, though freely downloadable, remains Adobe's property, so that the conversion has to be done by the user. Let me add that it also has a semi-bold version, and that you can call it either as mathcal/\mathbcal or as \mathscr/\mathbscr if you want to keep using the default \mathcal.

Here is an example of a code that shows how to use them (I comment all \usepackage but one):

        \documentclass[12pt]{article}
        \usepackage[utf8]{inputenc}
        \usepackage[T1]{fontenc}

        \usepackage{dutchcal}
        %\usepackage{boondox-cal}
        %\usepackage{boondox-calo}
        %\usepackage{bickham}

        \begin{document}%

         \[  \mathcal{D}\quad\mathbcal{D} \]%

        \end{document} 

Dutchcal:

Boondox:

Boondoxo:

Bickham:

Answer 4

To mimic a bold version of \mathscr one option is to use amsbsy package.

\documentclass{article}

\usepackage{mathrsfs}
\usepackage{amsbsy}

\begin{document}
$\mathscr{D}$\par
$\pmb{\mathscr{D}}$
\end{document}

Please note that \pmb is not an actual bold as package documentation suggests:

\pmb: Poor man's bold command, works by typesetting multiple copies of the given argument with small offsets.

Credit.