Trademarks are symbols and words used to identify a company, product or service (called servicemark in this sense). More than that, they’re managed by specialized organizations which not only take care of trademarks but intellectual property as a whole. Usually, each country has one of those organizations, often a branch of its government, which may – and usually does – follow WIPO (World Intellectual Property Organization) guidelines. That said, trademarks are not kid stuff; to register one you have to overcome many legal bureaucratic expensive barriers. That’s one of the reasons companies get really angry when they feel their ideas were stolen or copied. And the law is on their side.
Enough about bureaucratic mumbo jumbo; let’s talk about languages!