Throughout military history and modern technology, shields have been categorized into numerous distinct types based on design, era, and application. Historical combat shields include the classical Greek hoplon (round bronze-faced shield), the Roman legionary scutum (large rectangular body shield), the Viking circular wooden shield, and medieval kite and tower shields. In modern contexts, types include riot control polycarbonate shields, electromagnetic shielding meshes, radiation barriers, and roofing waterproof ice shields.
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