MMY clearly said in Beacon Light of Himalayas we could use the word mike or flower or pen, but we select "some special *sounds* (no hocus-pocus) which have the additional efficacy of producing vibrations whose effects are found to be congenial to our way of life"....Period!
"The theory of mantras is the theory of sounds" MMY Beacon Light. No special shaktipat or Diksha (that is reserved for your special relationship with your Sat-Guru when you merit it). FWIW.