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SACO stands for "Spherical Acoustic Cloaking." It is a concept in the field of acoustic engineering and metamaterials that involves the development of materials or structures capable of redirecting sound waves around a concealed object, rendering it acoustically invisible to outside observers. Inspired by the principles of optical cloaking, which involve bending light around an object to make it invisible, SACO aims to achieve similar invisibility effects for sound waves. The concept relies on the manipulation of acoustic wave propagation using specially designed metamaterials with unique acoustic properties, such as negative refractive index or anisotropic density distributions. By controlling the way sound waves interact with these metamaterials, researchers seek to create acoustic cloaks that can shield objects from detection by absorbing, reflecting, or refracting incoming sound waves in a controlled manner. Potential applications of SACO technology include stealth technology for military and defense purposes, noise reduction in industrial and transportation settings, and acoustic insulation for architectural and environmental purposes. While SACO remains a topic of ongoing research and development, recent advancements in metamaterial science and acoustic engineering have shown promise in overcoming technical challenges and moving closer to the realization of practical acoustic cloaking devices. If successfully implemented, SACO technology could revolutionize the way sound is controlled, manipulated, and perceived in various real-world scenarios, offering new opportunities for noise control, communication, and sensory enhancement.