What is the significance of this equation on my t-shirt?

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Hi everyone! I am a physics passionate and recently I got a t-shirt as a present that looks like this:
DSC_0124.jpg

and I really want to know what is this ecuation about. I have done some research and I am almost sure that it's related to the General Relativity because of the Wikipedia's Relativity entry jeje but if someone could help me more I would really appreciate it!

Thanks :)
 
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Looks like the geodesic equation. Einstein summation convention is used in the Wikipedia article.
 
thanks! It looks similar to the ecuations described in the geodesics entry. I will keep on searching to find more about it :)
 

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