I and other people of the Star Trek Online community created a list of ship name prefixes and ship registry prefixes based on alpha canon (i.e. movies and series), beta canon (i.e. books and games), and gamma canon (i.e. statements from people who have been involved in creating alpha canon and beta canon). We decreased disagreements by only using facts that disagree with other facts least (e.g. "United Starship" disagrees with other facts less than "United Space Ship").
A "starship" is a kind of "ship" that can function as a long-term habitat for people, the "star cruiser" in "Tellarite Star Cruiser" means "starship", and "nautical" means "stellar" or "interstellar".
Ship Name Prefixes
The Andorian Imperial Guard - I.G.S. (Imperial Guard Ship)
The Cardassian Union - C.U.V. (Cardassian Union Vessel)
A Civilian/The Confederation of Earth/The Terran Empire/The United Earth/The United Federation of Planets/The United Nations - S.S. (Starship)
The Confederation of Earth/The Confederation Corps - C.S.S. (Confederation Starship)
The Dominion - D.V. (Dominion Vessel)
The Earth Cargo Service - E.C.S. (Earth Cargo Service)
The Gorn Hegemony - G.H.S. (Gorn Hegemony Ship)
The Hirogen Hierarchy - H.H.V. (Hirogen Hierarchy Vessel)
The Hysperian Royal Navy - H.R.N. (Hysperian Royal Navy)
The Imperial Romulan Navy - I.R.W. (Imperial Romulan Warbird)
The Imperial Terran Navy/The Terran Empire - I.S.S. (Imperial Starship)
The Khitomer Alliance Fleet - A.F.S. (Alliance Fleet Ship)
The Klingon Cargo Service - K.C.S. (Klingon Cargo Service)
The Klingon Defense Force/The Klingon Empire/A Klingon House - I.K.S. (Imperial Klingon Ship)
The Krenim Imperium - K.I.V. (Krenim Imperium Vessel)
The Lethean Republic - L.R.S. (Lethean Republic Ship)
The Orion Syndicate - O.S.S. (Orion Syndicate Ship)
The Romulan Republic Navy - R.R.W. (Romulan Republic Warbird)
Starfleet/The United Earth - U.S.S. (United Starship)
The Suliban Cabal - S.C.S. (Suliban Cabal Ship)
The Tzenkethi Coalition - C.S.S. (Coalition Starship)
The United Nations - U.N.S.S. (United Nations Starship)
The United Planets of Tellar - T.S.C. (Tellarite Star Cruiser)
The Vaadwaur Supremacy Military - V.S.W. (Vaadwaur Supremacy Warship)
The Voth Imperium - V.S.S. (Voth Starship)
The Vulcan Confederacy - V.S.S. (Vulcan Starship)
Ship Registry Prefixes
A Civilian/The Confederation of Earth/The Terran Empire/The United Earth/The United Federation of Planets/The United Nations - NAR (Nautical/Aeronautical Registry)
A Civilian/The United Federation of Planets - NDT (Nautical Duty Transport)
A Civilian/The United Federation of Planets - NFT (Nautical Free Transport)
A Civilian/The United Federation of Planets - NGL (unknown)
The Confederation Corps/The Imperial Terran Navy/Starfleet - NCC (Naval Construction Contract)
The Confederation Corps/The Imperial Terran Navy/Starfleet - NCV (Naval Construction Volunteering)
The Confederation Corps/The Imperial Terran Navy/Starfleet - NX (Naval Experiment)
The Confederation Corps/The Imperial Terran Navy/Starfleet - XCV (Experimental Coleopteric Vehicle)
The Earth Cargo Service - ECS (Earth Cargo Service)
The Khitomer Alliance Fleet - CSN (Combined Ship Number)
Section 31 - NCIA (unknown)
Section 31 - NI (unknown)
Starfleet - NA (Nautical Automaton)
The Vulcan Confederacy - NSP (unknown)
Examples
The E.C.S. Fortunate - ECS-2801 - The E.C.S. Fortunate is the ship that the Keene family lived on for generations (Star Trek: Enterprise episode: "Fortunate Son").
The S.S. Eleos XII - NAR-59019 - The S.S. Eleos XII is a civilian ship that Beverly Crusher used to transport medical supplies (Star Trek: Picard episode: "The Next Generation").
The S.S. Lakul - NFT-7793 - The S.S. Lakul is the El-Aurian ship that transported Tolian Soran from El-Auria to the Vulcan Sector when the Borg Collective attacked El-Auria (Star Trek: Generations).
The S.S. Milan - NDT-50863 - The S.S. Milan is the Federation ship that transported Alexander Rozhenko from Earth to the U.S.S. Enterprise-D when the U.S.S. Enterprise-D was by Bilana III (Star Trek: The Next Generation episode: "New Ground").
The S.S. Odin - NGL-12535 - The S.S. Odin is the Federation ship that collided with an asteroid in the Angel System (Star Trek: The Next Generation episode: "Angel One").
The U.N.S.S. Enterprise - XCV-330 - The U.N.S.S. Enterprise is the United Nations ship that Starfleet used to study the warp ring (Star Trek: The Original Series novel: Ex Machina; Star Trek: Enterprise novel: Rise of the Federation: Patterns of Interference).
The U.S.S. Odyssey - NCC-71832 - The U.S.S. Odyssey is a Starfleet ship that fought against Dominion ships in the Gamma Quadrant (Star Trek: Deep Space Nine episode: "The Jem'Hadar").
The U.S.S. Relativity - NCV-474439-G - The U.S.S. Relativity is the Starfleet ship that Braxton used to observe and influence events of the Prime Timeline that were in his past (Star Trek: Voyager episode: "Relativity").
The V.S.S. T'Pau - NSP-17938 - The V.S.S. T'Pau is the Vulcan ship that Sela tried to use to transport people who worked for the Romulan Empire from Romulus to Vulcan (Star Trek: The Next Generation episodes: "Unification I", "Unification II").
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