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$E^\circ_\mathrm{cell}$ 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?

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    $\begingroup$ By convention, we write $V$ or $E$ to represent a difference in potential. Adding a $\Delta$ would refer to the difference in potential difference. $\endgroup$ – Zhe Oct 7 '19 at 13:27

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