$\textit{Thermal Insulance}$ is the reduction of heat transfer (the transfer of thermal energy between objects of differing temperature) between objects in thermal contact or in range of radiative influence. In building technology, this quantity is often called $\textit{Thermal Resistance}$, with the symbol $R$.
$M = 1/K$, where $K$ is "Coefficient of Heat Transfer"
Applicable units are those of quantitykind:ThermalInsulance
Thermal Insulance