How to get these symbols in LaTeX?

Question

In my book I found a few of weird symbols:

They are used as mark of ellipse, parabola and hyperbola, respectively (E-like, P-like and H-like letters in these images). How to get them in LaTeX (and by the way, what's their name)?

Answer 1

The math alphabet \mathcal is used for these symbols:

\documentclass{article}

\begin{document}

\[ \mathcal{E} \mathcal{P} \mathcal{H} \]

\end{document}