Standard symbol to denote a circular sector

Question

To denote a triangle we write $\triangle ABC$. How about a circular sector with $O$ at the center of the circle and with the arc $AB$. Is there a standard way such as $\lhd OAB$ where $\lhd$ has a round end?

Answer 1

I use

as in OAB. I don't know if LaTeX has a command for it - I just made it as an image and scale it to whatever size is needed for text in a given document.