Unfortunately your question is too vague to answer in depth. Trademarks are governed based on laws that originate from countries, so what is legal in one country may not be legal in another. As a general rule, Trademarks cannot be copied. So if you want to name your game "Star Trek" for example, you will probably get a lawsuit. If you want to name an object in your game "Shields" then you are safe, even though Star Trek uses the same name, because "Shields" is a description based name and cannot be copyrighted, for the most part. Ultimately, your best bet is to talk to a lawyer.
Derrick Bouchard
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