I should note that Shannon at one point says there are "14,000" languages in the world, because people when saying there are "7,000" languages in the world are forgetting that sign languages exist — however it is a bit presumptive to assume that there is a roughly equal number of signed languages as spoken languages.
Still, I think this is an intriguing perspective that makes me want to know more about the language dynamics and language politics of Deaf people around the world.
Well, that's at least closer to right. I would recommend you look more into sign languages and International Sign on your own.