Question
What does the two vertical parallel lines $(|\mid)$ represent in :
$
Zn_{(s)}\left|Zn_{(aq)}^{+2} \| Cu_{(sq)}^{2+}\right| Cu
$
$
Zn_{(s)}\left|Zn_{(aq)}^{+2} \| Cu_{(sq)}^{2+}\right| Cu
$
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