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This symbol appears at the origin of a coordinate plane in the Illustrative Mathematics curriculum, but I have no idea how to produce it using LaTeX or Tikz. Can you help me?

Sebastiano
  • 54,118

1 Answers1

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The desired character can be typed using the calligraphic font, obtained through the \mathcal command in math mode, e.g., $\mathcal{O}$ will give you the right typography,

enter image description here

A complete MWE is the following:

\documentclass[a4paper,12pt]{article}
\begin{document}
$\mathcal{O}$
\end{document}
Sebastiano
  • 54,118