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Sign language has linguistic structure. Vocalizations or signs that are composed of simple symbols are not language.

Fwiw, it appears you're saying "[human] sign language is complex; simple use of physical signalling is not language". But, your statement could be read as disparaging sign language as "not language", something I'd strongly refute.

I said that sign language has linguistic structure so it's language.

Proper language requires this structure, just making sings is not automatically language. Just the ability to signal using single atomic words, in some medium (signs, verbal, written, machine) is not a language.

What makes you say that?

My understanding of what 'language' means to cognitive scientists. You may have use different meaning for the language.

Only when you use semantic and syntactic structures to connect symbols into more complex meaning you are using language.

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