Seshat is one of my favorite goddesses. She rules over writing, architecture, libraries, building trades, astronomy, astrology and mathermatics. Although subsumed into Thoth as the patriarchies blended into older religions, she was the lady of the Library, the one who knew how to find true north when the north star was not aligned, and the one who recorded the deeds of the pharaoh for posterity.
Her symbol is a seven-pointed (star? flower? marijuana leaf? branches of knowledge? beanie?) something or other, still unknown despite various theories. She is often shown notching a palm leaf to record events, or with the measuring cord that was used to lay out temples. She is dressed in the leopard skin of the funeral priests, with the spots representing the stars in the sky. Builders often left tools as offerings for her in the foundations of their structures.