DvegaDvol

Etymology
From the mathematical formula $$\frac{\partial \mathcal{V}}{\partial \sigma}$$, the partial derivative of vega ($$\mathcal{V}$$) with respect to volatility (&sigma;), pronounced as "D vega (by) D vol(atility)".

Noun

 * 1)  A second-order measure of derivative price sensitivity, expressed as the rate of change of vega with respect to changes in the volatility of the underlying asset.