Those are window belly bars, also known as potbelly grilles. While they might look purely decorative, they’ve been used for practical purposes too. What are Window Belly Bars ...

They may deter crime. Some believe the potbelly design is a security measure.The outward curve makes it more challenging for burglars to maneuver tools between the bars, making break-ins harder.

Yes. A window “hood” is interchangeable with yoke. Are yokes purely decorative or do they offer any function? Yokes are effective devices to deflect rainwater from entering the building.