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where one can see a big dot (and circle) over W. I am using \dot{W} and \mathring{W} but seems not big enough.

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3 Answers 3

up vote 14 down vote accepted
\documentclass{article}
\usepackage{accents}
\begin{document}
$\accentset{\bullet}{b}$
\end{document}
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1  
This in fact answered another question of mine: How to write a big dot as in the dot product of vectore? The word 'bullet' reminded me! –  Host-website-on-iPage Dec 10 '13 at 6:57
\documentclass{article}
\usepackage{stackengine}
\renewcommand\useanchorwidth{T}
\newcommand\obullet[1]{\ensurestackMath{\stackon[1pt]{#1}{\mkern2mu\bullet}}}
\newcommand\ocirc[1]{\ensurestackMath{\stackon[1pt]{#1}{\mkern2mu\circ}}}
\begin{document}
$\ocirc{W}\obullet{x}$
\end{document}

enter image description here

If you need it to preserve the math style...

\documentclass{article}
\usepackage{stackengine,scalerel}
\renewcommand\useanchorwidth{T}
\newcommand\obullet[1]{\ThisStyle{\ensurestackMath{%
  \stackon[1pt]{\SavedStyle#1}{\SavedStyle\kern.6\LMpt\bullet}}}}
\newcommand\ocirc[1]{\ThisStyle{\ensurestackMath{%
  \stackon[1pt]{\SavedStyle#1}{\SavedStyle\kern.6\LMpt\circ}}}}
\begin{document}
$\ocirc{W}\obullet{x};
\scriptstyle\ocirc{W}\obullet{x};
\scriptscriptstyle\ocirc{W}\obullet{x}
$
\end{document}

enter image description here

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You can do the same with the amsmath package command \overset

\usepackage{amsmath} 

$\overset{\bullet}{W}$

see also the thread How to make a larger “\dot” to change the size of the dot.

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1  
Welcome to TeX.SX! You can have a look at our starter guide to familiarize yourself further with our format. –  yo' Jan 15 at 1:41

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