Take your pick between parking:side:restriction=no_parking from the approved new schema street parking wiki (same as in old schema) or just no which was found in the Italian traffic signs wiki
Little doubt what ‘no’ means but which is understood by the data consumers as in ‘no what?’ (So happens the English No translates to Italian as No.). Stick to the documented root, and what JOSM and ID understand is what I’d choose for…
(And I’d like to soundboard this with international community for ‘no’ is really KISSed)