RIS (Romulan Imperial Starship) is a prefix used to differentiate Tal Prai'ex starships from regular Romulan Guard starships, who use the prefix IRW. (TOS video game: Starfleet Command (game), RIS Bouteina various)

RIS also stood for Romulan Issue of the Senate. (Star Trek: The Stoneship Files: "At the Soapbox Races")

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