Signs can differ depending on culture, background, age and a host of other factors. This was an interesting article I found on the difference between signs in the African-American culture vs. Caucasian cultures. Take a look.

http://www.washingtonpost.com/lifestyle/style/sign-language-that-african-americans-use-is-different-from-that-of-whites/2012/09/17/2e897628-bbe2-11e1-8867-ecf6cb7935ef_story.html

http://deafyouvideo.blogspot.com/2012/09/black-american-sign-language-and.html

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