Rosh means: 1) The Shechina 2) The highest levels of the Neshsma,
This is explained in the context of three examples:
1) HaChacham Ainav biRosho (Roe’ Es HaNolad).
2) ViGula Al Rosha (Geula because the Shechina (which was in Galus with us) departs from Galus or the Neshama that though in Golus has Pintele that preserves it.
3) Ain Omdin LiHispalel Ela Mitoch Koved Rosh of the Shechina (Chisaron rooted in Tzimtzum HaRishon) and of the Neshama that is automatically aroused (because Ahavas Hashem is natural to it).