From my friend, Chris Salituro's sociology blog:

We have been examining the components of culture. The non-material aspects of culture are often the most important but we are often unaware of them. One type of non-material culture is symbolic culture, or gestures and language. Here is a link to a list of some single hand gestures from around the world.

Language is important too as it affects how we think. When we think about something, we are using language inside of our heads so if we use certain words or do not have certain words, it may affect how think about things especially how we categorize something. This was first studied by Saphir and Whorf. Sapir-Whorf has been critically contested in recent years, but the NY Times ran a story about how there is still some merit to the idea of language affecting our thoughts. See that article here. Here is a book that highlights untranslatable words from around the world.
Here is a study explaining that with out language, numbers do not make sense.