It is said that these two characters together symbolize the birth and death of all things, like we are born with "a" and our mouth open (inhale) and we die with "um" and our mouth closed (exhale). This is similar to "Alpha and Omega" or "A to Z" signifying "beginning and end", "everything" or "all creation." The contraction of both is "Aum" (Devanagari ॐ), which is an important concept in Sanskrit. The stances and expressions of the statues, the sounds "a" and "um" and the symbolism behind this are very import in the Hōjō no kata.