In surveying and geospatial applications, a Big Prism is a high-precision optical device that reflects laser or light signals to provide precise measurements of angle and distance. Its main parts are the protective case, mounting fixtures, and reflective surface, all of which are made of premium optical glass or metal. Big Prisms are extensively utilised for large-scale surveys and mapping in sectors including mining, civil engineering, and construction because of their sophisticated optical engineering design. These prisms help clients by guaranteeing accuracy in infrastructure development, increasing project efficiency, and boosting measuring accuracy across vast distances. For smooth operation, they frequently work with laser rangefinders and total stations.