The enthalphy change for the process, ${\mathrm{I}}_2\left(\mathrm{s}\right)\to {\mathrm{I}}_2\left(\mathrm{g}\right), ∆\mathrm{H}=+\mathrm{x} \mathrm{kJ}$is called enthalpy of

Conversion of solid to gas is called sublimation;

Therefore the enthalpy change is called enthalpy of sublimation;