What is Vanna in option value

What is Vanna in option value?

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Vanna: The Vanna is the sensitivity of delta to volatility.

2V/∂S∂σ.

It is used while testing sensitivity of hedge ratios to volatility. This can be misleading at places where gamma is small. And Gamma, which is an option or a portfolio of options, is the second derivative of position concerning the underlying.

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