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Square gratings are a fundamental concept used in various fields such as optics, telecommunications, and materials science. These structures are composed of periodic arrangements of elements, typically square-shaped apertures or grooves, which interact with light or other waves. Their unique properties enable a wide range of applications, making them a subject of significant interest in both theoretical studies and practical implementations.

Bollards are short, sturdy posts that serve various purposes in urban settings. They are often used to control vehicle access, protect pedestrians, and delineate spaces. Their appearance can vary widely, from sleek modern designs to ornate historical styles, allowing them to blend seamlessly into a city's architecture. By creating physical barriers, bollards help in preventing vehicles from entering pedestrian areas, thereby enhancing safety. This is particularly crucial in busy urban centers where foot traffic is high, and the risk of accidents is present.