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A common phrase that's bandied about when talking about DomainSpecificLanguages (or indeed any computer language) is that of noisy syntax. People may say that Ruby is more noisy than Java, or that external DSLs are less noisy than internal DSLs. By Syntactic Noise, what people mean is extraneous characters that aren't part of what we really need to say, but are there to satisfy the language definition. Noise characters are bad because they obscure the meaning of our program, forcing us to puzzle out what it's doing.