In the context of the Laghunyasam and the Sri Rudram rituals you’ve been analyzing, the distinction between “Crest” and “Head” is a precise technical one related to Anganyasa (assigning mantras to body parts).
In these Sanskrit texts, they refer to two distinct energy centers:
1. The Head (Shirshas / शीर्ष)
* Sanskrit Term: Shiras or Shirshas.
* The Concept: This refers to the physical head as a whole.
* The Mantra: In the Nyasa sequence, you typically touch the sides of your head or the forehead while reciting a specific mantra (often ending in Svaha).
* Symbolism: It represents the seat of the intellect and the “Top” of the Vedic structure.
2. The Crest (Shikha / शिखा)
* Sanskrit Term: Shikha.
* The Concept: This refers specifically to the Crest or the “tuft” of hair at the very top-back of the head (the crown).
* The Mantra: When performing Shikhayai Vashat, you touch this specific point (where a traditional Choti or Kudumi is kept).
* Symbolism: In Yoga and Tantra, the Crest represents the point of exit for the soul and the connection to the divine. It is the “antenna” of the spiritual body.