What Leonardo da Vinci invention uses a pyramidal wooden frame as an early parachute design?

Leonardo da Vinci's early parachute design is known as Leonardo's parachute.

Leonardo sketched the design in the Codex Atlanticus around 1485. It consists of a large, sealed linen canopy stretched over a pyramidal wooden frame. His notes proposed that a person could jump from a height while suspended beneath the structure.

The design was based on the principle that air resistance under a broad canopy could slow a fall. Leonardo wrote that a person could descend safely from any great height, although he did not record a construction test. In 2000, British adventurer Adrian Nichols built and tested a modern version inspired by the drawing, using contemporary materials and a safety parachute.

Leonardo's design is not the same as a modern fabric parachute: its rigid frame would make it heavier and less practical. The concept nevertheless predates the successful parachutes of later inventors by centuries.