Estimate of the lower bound on the Bjorken transverse energy density in pp, p$-$Pb, and Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV, considering the exclusive ($\cap$, open markers) and inclusive ($\cup$, full markers) overlap area $S_{\rm T}$ of the nucleons. The expression ${C N_{\rm part}^p}$ is fitted to case ${\cup}$, and we find $C=(0.8\pm0.3)$ ${\rm GeV}/({\rm fm^2}c)$ and ${p=0.44\pm0.08}$. Also shown is an estimate, via ${\rm d} E_{\rm T}/{\rm d}y$, of $\varepsilon_{\rm Bj}$ from Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV (stars with uncertainty band) .