Suruga-style torture; Edo-period bondage torture
A historical form of torture from the Edo period where the victim was hung from the ceiling with hands and legs bound behind the back and a rock placed on the back.
Suruga-doi is a type of torture from the Edo period.
I saw a reproduction model of Suruga-doi at the museum.
The term combines 駿河 (Suruga, an old province name) and 問い (interrogation/torture). The exact origin of the name is uncertain, but it likely refers to a torture method associated with or named after the Suruga region.