Ḥolam, Shuruk, Ḥirik 39. These three lines are also called by the names of three vowels: ḥolam, shuruk, and ḥirik. The right line is the mystical meaning of the ḥolam vowel. The left line is the mystical meaning of the shuruk vowel, that is, the melafum, which is a vav with a dot inside it. The middle line is the mystical meaning of the ḥirik vowel.
Holam, Shuruk, and Hirik as Mystical Pathways
Introduction to Sulam Commentary 39:1