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Is Sign language an international language , or it depends on each country's main language ?
There is definitely differences in sign language. For example, American Sign Language is different than British Sign Language. There are similarities, but they can be considered different languages.
Usualy you can use the sigh. But the question is that sign has different meaning in different region according to the local culture. To avoid such misunderstanding, you'd better use local language or get familiar with the sign before.
If you like to communicate simple things in daily life, sign language is enough , however, if you want to talk more deeply , sign language perhaps seems not capable.
Sign language is not intenational. This site has sign language dictionaries for various sign languages all over the world: http://www.spreadthesign.com/us/