We suggest that any khipu moving within the state administrative system bearing an initial arrangement of three figure-eight knots would have been immediately recognizable to Inca administrators as an account pertaining to the palace of Puruchuco.
The use of conventional signs is my definition of writing, ... information is being passed through three different levels in ways suggestive of a conventional system.
We hypothesize that the arrangement of three figure-eight knots at the start of these khipu represented the place identifier, or toponym, Puruchuco,