The aspirate ‘h’ ( h ) sound is representative of the sharira or the body, as explained in the shlöka above. This is the bija-mantra for the Throat-chakra.
‘a’ ( A ) combines phonetically with the second pure vowel ‘i’ ( [ ) to give ( [+A) – ‘ya’ ( ya ) and this is the bija-mantra for the Heart or Anahata chakra. This signifies the reflection of the Ishvara and the Unknown in the hridaya or the human heart.