Star Trek Ship Name Question?

In the Star Trek universe, ships are titled USS Enterprise, or USS Voyager. What does the "USS" stand for? In the United States Navy, "USS" stands for "United States Ship". But there is no US government in the Star Trek world. So why don't the ships have a name like... show more In the Star Trek universe, ships are titled USS Enterprise, or USS Voyager. What does the "USS" stand for? In the United States Navy, "USS" stands for "United States Ship". But there is no US government in the Star Trek world. So why don't the ships have a name like "FSS" for "Federation Star Ship"?

Right, so the main question is: WHAT does the USS stand for in the title of Star Trek ships?

Thanks!
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