How to get the Reinforced symbols?

Question

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I can not find it in sym­bols-a4.pdf. Maybe it is not universal notation.

Answer 1

The creation of such symbols are fairly straight forward if you follow the "\ooalign tutorial| in \subseteq + \circ as a single symbol (“open subset”):

\documentclass{article}
\usepackage{graphicx}% http://ctan.org/pkg/graphicx
\newcommand{\symbolA}{{%
  \ooalign{\raisebox{.3ex}{\scalebox{.9}{o}}\cr\hss\rule{.4pt}{1.5ex}\hss}}}
\newcommand{\symbolB}{{%
  \ooalign{\hss\raisebox{.3ex}{\scalebox{.9}{o}}\hss\cr\hss\rule{.4pt}{1.5ex}\hss\cr\rule{1.5ex}{.4pt}}}}
\newcommand{\symbolC}{{%
  \ooalign{\hss\raisebox{.3ex}{\scalebox{.9}{o}}\hss\cr\hss\rule{.4pt}{1.5ex}\kern1pt\rule{.4pt}{1.5ex}\hss\cr\rule{1.5ex}{.4pt}}}}
\begin{document}
Some text \symbolA{} \symbolB{} \symbolC{} and some more text.
\end{document}

However, these symbols do not scale properly if used as exponents in math mode.

Answer 2

A possible improvement of Werner's solution. The key point is that it's not necessary to specify some of the dimensions, while keeping the vertical rules as high as capital letters.

Redefine \reinforcedmain at will, maybe you can find a better way to draw the circle.

\documentclass{article}

\newcommand{\reinforcedmain}{\raisebox{.3ex}{o}}
\newcommand{\reinforcedrule}{\vrule height\fontcharht\font`\A }
\newcommand{\reinforcedA}{{\normalfont
  \ooalign{\reinforcedmain\cr
           \hss\reinforcedrule\hss
  }%
}}
\newcommand{\reinforcedB}{{\normalfont
  \ooalign{\reinforcedmain\cr
           \hss\reinforcedrule\hss\cr
           \noalign{\hrule}%
  }%
}}
\newcommand{\reinforcedC}{{\normalfont
  \ooalign{\reinforcedmain\cr
           \hss\reinforcedrule\kern.4pt\reinforcedrule\hss\cr
           \noalign{\hrule}%
  }%
}}

\begin{document}
Text \reinforcedA{} \reinforcedB{} \reinforcedC{} end.
\end{document}

Following the suggestion of Marc van Dongen, here's a possibly improved version where the thickness of the rules varies according to the type size; the rule thickness is in the \reinforcedthickness parameter.

\newcommand{\reinforcedmain}{\raisebox{.3ex}{o}}
\newcommand{\reinforcedrule}{%
  \vrule height\fontcharht\font`\A width \reinforcedthickness\relax}
\newcommand{\reinforcedthickness}{0.04em}

\newcommand{\reinforcedA}{{\normalfont
  \ooalign{\reinforcedmain\cr
           \hss\reinforcedrule\hss
  }%
}}
\newcommand{\reinforcedB}{{\normalfont
  \ooalign{\reinforcedmain\cr
           \hss\reinforcedrule\hss\cr
           \noalign{\hrule height\reinforcedthickness}%
  }%
}}
\newcommand{\reinforcedC}{{\normalfont
  \ooalign{\reinforcedmain\cr
           \hss\reinforcedrule\kern\reinforcedthickness\reinforcedrule\hss\cr
           \noalign{\hrule height\reinforcedthickness}%
  }%
}}