I just was wondering what is the meaning of this symbol(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\stackrel{\smile}{\frown}

[/itex].

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}".

Thanks in advance.

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# Strange Symbol

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