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How to write the letter θ as bold and not italic?

I have tried the following but it gives me the θ as italics and not bold:

\textbf{$\theta$}
Stephen
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Vassilis Chasiotis
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    bm package \bm{\theta] – David Carlisle Jul 03 '15 at 18:15
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    David, the θ is getting bold, but again is Italic. The θ is a vector. So, I want it "lots of bold" and not Italic. – Vassilis Chasiotis Jul 03 '15 at 18:22
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    This question explicitly asks about getting the same behaviour of \mathbf has with letters but with greek letters: \mathbf{a} gives a, the author wants \greekmathbf{\alpha} to give α rather than *α*. – Manuel Jul 03 '15 at 18:43
  • Why the reopen? The OP agreed about the duplicate (when the OP agrees, Community closes). This question asks how to get bold for greek math letters and the linked question answers exactly that. – Alenanno Jul 03 '15 at 20:04

1 Answers1

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Instead of \textbf use \boldsymbol (load the amsmath package to get it) to get it bold, put everything in math mode, and to get it upright use the upgreek package and \uptheta instead of theta:

\documentclass{article}
\usepackage{amsmath}
\usepackage{upgreek}
\begin{document}
$\boldsymbol{\uptheta}$
\end{document}

If you do not need it just for one theta, also see at Bold math: Automatic choice between \mathbf and \boldsymbol for Latin and Greek symbols?

Stephen
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