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In JavaScript, Symbol is a built-in object type that allows unique values to be produced. Symbols are primarily used as unique identifiers for object properties. Symbols do not create conflicts with any other property names, so they're great for adding properties that shouldn't interfere with others in the object.

In React JS, Symbol often comes up in use with React's context feature which allows passing data through the component tree without having to pass props down manually at every level. It comes up where unique identifiers are required, as React itself uses Symbols for internal handling like `React.Symbol`.

Unfortunately, a code snippet using Symbol in React would be much too in-depth for this explanation, as it would involve a broad understanding of how React works in depth. However, it is important to know that Symbols are a part of JavaScript that React utilizes, and form an essential part of understanding some parts of how React works under the hood.

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