Cuneiform script is one of the earliest known forms of written expression. Emerging in Sumer around the century BC, with predecessors reaching into the late millennium (the Uruk IV period), cuneiform writing began as a system of pictographs.
This petroglyph from Siberia is dated to around 5000 BCE. (It reminds me of legends of many-headed demons from the Ramayana, though Ravana had ten heads. And also of Tilak's theory of an Arctic source for the Vedas).