what is the graph of this function? f(x)=[[x]]+2/2 if 0 is greater than or equal to x which is <6

Sorry... we cannot answer as written. What do the [[ ]] around x mean? Absolute value of x, as in |x|? Is [[x]]+2/2 actually (x+2)/2? Is x < 6, or x < 0? Help!