1.  The fourth rune of the Elder Futhark, representing the letter A.

The meaning of this rune is mouth, and as such usually indicates the spoken word, the taking of advice, or the acquisition of wisdom.

2.  This is the fourth rune of the futhark. Whereas Thurisaz represents the forces of chaos, Ansuz represents order, the defenders of which, in our mythology, are the Aesir.

I know a fourth one: it will free me quickly If foes should fetter me fast With strong chains, a chant that makes Fetters spring from the feet, Bonds burst from the hands.