The Two Worlds was a term coined by Romulans and others in the Romulan Star Empire, used to refer to the capital planets of Romulus and Remus.
History and specificsEdit
Donatra and Norvid used this term to refer to Romulus and Remus in conversations they had in the year 2380. (TNG novel: Q & A)
Another term used was Hearthworlds. (TOS - Rihannsu novels: Swordhunt, Honor Blade, The Empty Chair, TNG - Tales of the Dominion War short story: "The Ceremony of Innocence is Drowned")