Why is E°(cell) not ∆E°cell?

$E^\circ\_\mathrm{cell}$ is the EMF of the cell for a reaction with respect to standard hydrogen electrode (SHE). So why don't we represent $E^\circ\_\mathrm{cell}$ or $E\_\mathrm{cell}$ by $\Delta$ symbol, in the same manner in which we represent $\Delta H^\circ$, $\Delta G^\circ$, $\Delta S^\circ$, etc., with respect to initial absolute zero temperature?


