す
SU — practice syllable
The kana す is rendered as the first selected practice syllable, close to the throat and mouth because it is used in the documented SU-A-WA exercise. This is a renderable vocal focus only; no canonical Kototama organ assignment is asserted for SU.
Point 6 of 9 in Kototama Sound Body — A-I-U-E-O vowel foci
Cross-tradition overlaps
No overlapping points are registered for this point.
Sources
Masahilo M. Nakazono, Inochi — The Book of Life (scholarly_modern)
Modern Nakazono source for free sound work and the SU-A-WA preliminary practice.
Kototama Sound Practice as taught by M.M. Nakazono (secondary)
Presents SU-A-WA as a fundamental sound practice and distinguishes the Father-sound consonant set.