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The issue of association between certain symbols and a particular source is, of course, the essence of trademark law. The logic of protecting symbols used by an owner to allow consumers to identify the source of their goods and services is fairly straightforward: we protect the associations that consumers make when they see a symbol in the marketplace. It helps promote fair competition, but it is also a way to protect consumers and prevent purchase decisions based on misinformation (such as a counterfeit mark). The logic is that if a symbol is associated with one source, consumers will receive goods or services that meet the level of quality that have always been associated with that symbol.
Can any type of symbol function as a trademark? Certainly. After all, the statutory language is fairly broad in what a person can use to identify their wares: “any word, name, symbol, or device, or any combination thereof” just so long as the symbol actually identifies and distinguishes the goods. The words identify and distinguish go to the ability of consumers to associate a product with a source. What good is a symbol if it can’t identify the source of goods?