LaTeX Symbol \stackrel{\smile}{\frown}: Meaning & LaTeX Command?

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SUMMARY

The symbol \stackrel{\smile}{\frown} is utilized in the context of estimating norms, although it is not widely recognized as a standard notation. Users seeking to implement this symbol in LaTeX can do so using the command \stackrel{\smile}{\frown}, but there is currently no alternative command available for a more straightforward input. The discussion highlights a gap in documentation regarding the symbol's meaning and usage in mathematical literature.

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I just was wondering what is the meaning of this symbol
\stackrel{\smile}{\frown}<br />.
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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I just have found the symbol, so now the question is
what does it mean?
\asymp.
 

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