The Runes of T'Vish were an aspect known to the Vulcan civilization.

At the age of twenty to twenty four, a young Vulcan was expected to take part in the Runes of T'Vish which were logical paradigms. They led to behavioral modification as well as multplication right to left, diagonal and cross multiplication. The teachings learnt at this stage also led to the isolation of the Katra. (TOS novel: Battlestations!)