Waffle slab
https://en.wikipedia.org/wiki/Waffle_slab
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Waffle slab is the most technical and economical type of roofs among conventional systems. The main element in the construction waffle slabs is waffle formwork[1]. A waffle slab or two-way joist slab is a concrete slab made of reinforced concrete with concrete ribs running in two directions on its underside.[2] The name waffle comes from the grid pattern created by the reinforcing ribs. Waffle slabs are preferred for spans greater than 40 feet (12 m), as they are much stronger than flat slabs, flat slabs with drop panels, two-way slabs, one-way slabs, and one-way joist slabs.[3]
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1977 911S Targa 2.7L (CIS) Silver/Black
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