Double array initialization in Java

I was reading a book on Java and came across an example in which an array of type double was initialized in a way that I haven’t seen before. What type of initialization is it and where else can it be used?

double m[][]={
    {0*0,1*0,2*0,3*0},
    {0*1,1*1,2*1,3*1},
    {0*2,1*2,2*2,3*2},
    {0*3,1*3,2*3,3*3}
};

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