Silisyum, or silicon, is a chemical element with the symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster. Silisyum is the second most abundant element in the Earth's crust, primarily found in the form of silicates and silicon dioxide. Silisyum is widely used in various industries, especially in electronics, where it serves as a key material for semiconductors. Its unique properties allow it to efficiently conduct electricity, making it essential for the production of computer chips and solar cells. Additionally, silisyum is used in the manufacturing of glass and ceramics.