"Warpstone"

A series of two over-lapping lines crossing at 45 degree angles and forming a "tic-tac-toe" board on its side. This symbol represents a series of inter-locking tunnels surrounding the world in the never ending search for warpstone. The symbol was originally adopted at Cripple Peak by Clan Rikek to mark shipments of Warpstone to Skavenblight, and is now generally used to represent the letter "W". See Skaven army book, pages 15 and 69, second rune from left. (It can also be found on the reverse side of the warpstone counters in the Battle Magic supplement).