A Spelling Collision with an Unrelated Practice

Ham is the seed of vishuddha, the throat center, ruled by ether or space in Purnananda Yati's 1577 Shat chakra nirupana, the same source that fixes the rest of the six chakra scheme in this atlas, and its sixteen petals are explained there as carrying the sixteen Sanskrit vowels, a detail that ties this chakra explicitly to speech and the alphabet in a way the other centers are not.

Because vishuddha is specifically the speech center, its bija has drawn more grammatical commentary than most of the others, and the central dispute concerns whether ham should be read as related to hamsa, the swan or goose that is also a common symbol for the individual soul and appears in the unrelated breath practice so ham described elsewhere in this atlas. Some later devotional commentary links the two, treating vishuddha's seed as evidence that speech and the breath soul are connected faculties housed at neighboring points in the subtle body. Scholars working from Purnananda's Sanskrit directly generally reject that link as a later, popular conflation rather than something the text itself asserts, on the ground that the Shat chakra nirupana derives its sixteen chakra seeds and its main six chakra seeds from separate parts of its alphabetic scheme, the matrika system, with no textual indication that ham the throat seed and ham or hamsa the breath syllable are meant to be read together. The confusion is understandable given the identical spelling once diacritics are dropped, but the two are treated in the Tantric source material as belonging to different systems entirely.