"The Supreme Court website includes the following text, which is a slightly amended version of the words of the artist, Nolli (at least as quoted by Jon Lim, but alas without attribution).

'In the tympanum sculpture, the central figure represents Justice; to the left is a person begging for mercy (or protection), and next to him are the legislators with books in hand, representing the Law. On the other side of Justice is a figure showing gratitude, then a man and a bull, and two children holding a sheaf of wheat, all representing Wealth, Prosperity and Abundance where Law and Justice prevails.