On an web form, where a user can select one country or several, I want to use a label more concise than Country or Countries. Is Country(ies) correct?
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There is no universal rule for this.
There is plenty of precedent for "Country(ies)" (millions of Google hits)
There is also precedent for "Country/ies".
From a User Experience perspective, I'd say that a simple "Countries" would be best. It's less awkward than trying to cover all bases with slashes/brackets, and it doesn't mean that user absolutely has to pick more than one, it simply means that they should pick any and all that apply.