It's a Schengen visa with limited territorial validity, allowing entry only to one or a few specific Schengen countries. It's issued in exceptional situations, like humanitarian grounds or when a normal Schengen visa can't be granted.
It restricts where you can travel inside the Schengen area. Travelling to a country outside the visa's scope can lead to refusal of entry.
Official source
Ministero degli Affari Esteri
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