Avyaktam means unexpressed, undifferentiated or unmanifest. It is derived from the etymology a+vyaktam, a means not and and vyaktam means expressed, differentiated or manifest. It is first found in germinal form in the [wiki]Vedas[/wiki] as the deity Vak, who is the deity of speech(similar to the principle of the logos or the word in Christianity) Later, vak evolved into the concept of the [I]pranava[/I], the divine sound or primordial vibration of AUM that created the entire universe.