As stands for life and wisdom. Odin, the god of storm and winds was the first to grant humans breath, thus linking As with life.

Without breath, man could not make any sounds or words, and therefore, As is also closely linked to wisdom.

As is a synthesis of Ur and Thurs - it has the power to create cosmos from chaos. So it was with the first humans who were granted life by Odin and so it will be with those who use the power of this rune in their practices.