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Thurisaz ("giant, thorn") 
represents the power of chaos and protection, referring to a frost giant or a thorn. 
It may be derived from the Greek letter theta, simplified to a tapered spike.

Keywords:
Destruction, chaos, great power
Illustration Elements:
Níðhöggr, the dragon gnawing at the roots of the World Tree
Mythological Background:
The dragon dwelling in Niflheim, gnawing at the roots of the World Tree, symbolizes destruction and renewal.
Symbolist Meaning:
Challenge and conflict, the rebirth born from destruction.
Quote: "Below the roots, the dragon gnaws."

Source: Poetic Edda Völuspá