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Gebo ("gift, exchange") 
symbolizes giving and balance, and is a symbol of friendship and covenant. 
The intersecting lines of the X represent mutual giving and the exchange of energy.

Keywords:
Gift, sacrifice, exchange of wisdom
Illustration Elements:
Mímisbrunnr, the Well of Wisdom where Odin traded his eye for insight
Mythological Background:
Odin gouged out one eye and plunged it into the Well of Wisdom in exchange for insight.
Symbol Meaning:
Giving, exchange, sacrifice in exchange for wisdom.
Quote: "One eye for all seeing."

Source: Poetic Edda, Völuspá