Harry Potter symbols

The second symbol is easy:

\documentclass{article}
\usepackage{tikz}

\begin{document}
  \begin{tikzpicture}[baseline=0]
    \def\a{1cm}
    \pgfmathsetlengthmacro\radius{\a/2 * tan(30)}
    \draw[thick]
      (0, 0) -- (60:\a) -- (\a, 0) -- cycle
      (\a/2, 0) -- (60:\a)
      (\a/2, \radius) circle[radius=\radius]
    ;
  \end{tikzpicture}
\end{document}

A slight modification, some images show a smaller inner circle, e.g.:

\documentclass{standalone}
\usepackage{tikz}

\begin{document}
  \begin{tikzpicture}[baseline=0]
    \def\a{1cm}
    \pgfmathsetlengthmacro\radius{\a/2 * tan(30)}
    \draw[thick]
      (0, 0) -- (60:\a) -- (\a, 0) -- cycle
      (\a/2, 0) -- (60:\a)
      (\a/2, \radius) circle[radius=\radius-.75\pgflinewidth]
    ;
  \end{tikzpicture}
\end{document}

The first one can also be drawn with TikZ. A grid can be put on the symbol to get the coordinates of the vertices. Easier would be to include is as image.

There's the Parry Hotter font. It's a TTF, so you'll need XeLaTeX to use it.

Of course, you could google for any other font and use that as well.