Synonym for the grape variety Petit Rouge; see there.
The red grape variety originates from the border region between Italy and Switzerland. Synonyms are Orion Gris, Oriou, Oriou Curare, Oriou Lombard, Oriou Petit Rouge, Oriou Picciou, Oriou Voirard, Petiou Rodze, Picciou Rouge and Rouge du Valais.

In Switzerland, the variety is categorised as an Old Growth grape variety. It is one of the oldest and most widespread varieties in the Aosta Valley. The varieties with the Oriou part of the name are...
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Roman Horvath MW
Domäne Wachau (Wachau)