A traditional Romulan meditation in which a person walks a patterned path to explore the mind, used by Narek to draw out the secret hidden in Soji's dreams.
The Zhal Makh is a Romulan meditative ritual. The person performing it paces slowly along a winding pattern set into the floor of a dedicated room, and in doing so is able to re-enter and examine a dream or memory. Romulans consider it deeply private, and it is not normally shared with outsiders.
It appears in the Star Trek: Picard episode The Impossible Box. Aboard the Artifact, the Tal Shiar agent Narek persuades Soji Asha that the ritual will help her understand a recurring nightmare about her father. He guides her through it and she at last sees what the dream contains, a workshop on a world with two red moons and constant lightning.
That is all Narek and his sister Narissa need to locate the synthetic homeworld. He leaves Soji locked in the room with a puzzle box that releases lethal radiation, which triggers her awakening as a synthetic.