Thyrsus, an attribute of Dionysus, being a staff or spear entwined with ivy leaves and a cone at the top; carried by the devotees of the god on festive occasions; the cone was presumed to cover the spear point, a wound from which was said to cause madness.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Thurso * Tian-Shan