# Strange Symbol

1. Nov 28, 2011

### LikeMath

I just was wondering what is the meaning of this symbol
$\stackrel{\smile}{\frown}$.
It is used in the terminology of estimation of norms, I do not know if it is a standard notation, since I did not find anymore explanations. Also I do not know if there is a command to write it directly by LaTeX instead of "\stackrel{\smile}{\frown}".
$\asymp$.