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Like in the game ST: Shattered Universe it is doubtful if this vessel existed or if it used a different name in our universe since the Terrans seem to use words like, Avenger, Merrciless*, Destroyer, etc. so this ship in our universe may have a different name. Who made this anyway? Rift Fleet 16:39, 10 October 2008 (UTC)

The Avenger NX-09 does indeed appear with this name and registry in ST video game: Legacy. There are also other sources with various other Federation ships named avenger. Bethesda Softworks made the Legacy game. -- Captain MKB 15:53, 12 October 2008 (UTC)
Ships named Avenger
United States Small craft class: TBF Avenger USA flag
Federation Starfleet USS Avenger (NX-09, NX-class)USS Avenger (NCC-1980)USS Avenger (NCC-1860, Miranda-class)USS Avenger (Defiant-class)USS Avenger (NCC-97500, Avenger-class prototype)

see also: Avenger-class (23rd century scout)Avenger-class (25th century battlecruiser)

UFP emblem image. Seal of the Federation Starfleet.
Terran Empire ISS Avenger (NX-09, NX-class)ISS Avenger (NCC-95792, Sentinel-class) Seal of the Terran Empire.
United Earth Starfleet Avenger (NX-09, NX-class) Earth's seal. Starfleet emblem. Klingon Defense Force IKV Avenger Klingon Empire flag image.
Romulan Star Empire Avenger (22nd century warship)Avenger (K'hanakh-class) Emblem of the Romulan Star Empire. Cardassian Union CDS Avenger (scout)CDS Avenger (Galor-class battleship) Emblem of the Cardassian Union


if the Terran Empire use "Evil" Names as you say then why do they have a ship named "Enterprise"?

It is implied that everything in our universe also exists in the Mirror Universe. USS Enterprise (NCC-1701) = ISS Enterprise (ICC-1701), using that same logic we can assume that ISS Avenger (NX-09) would have a USS Avenger (NX-09) Counterpart.