Lintel

A lintel or lintol is a type of beam that spans openings such as portals, doors, windows and fireplaces. It can be a decorative architectural element, or a combined ornamented/structural item. In the case of windows, the bottom span is referred to as a sill, but, unlike a lintel, does not serve to bear a load to ensure the integrity of the wall.

Modern-day lintels may be made using prestressed concrete and are also referred to as beams in beam-and-block slabs or as ribs in rib-and-block slabs.
These prestressed concrete lintels and blocks can serve as components that are packed together and propped to form a suspended-floor concrete slab.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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