It means "enclosed".
Typically used when wanting to reference that something is attached.
I.E. - A Job application Cover Letter can have the following at the end of the page:
Enc: Resumé
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bean, dean, Jean, lean, mean, Sean, wean
seven letter words start with E and end with the letter A?
Countries that end with the letter y:GermanyHungaryItalyNorwayParaguayTurkeyUruguay
There are no 6 letter words that end in COP.
There aren't any countries that end in the letter w