The word 设备 is formed by combining two characters, each contributing a core meaning that merges into a single concept. The first character, 设 (shè), carries the fundamental idea of "to set up", "to establish", or "to arrange". The second character, 备 (bèi), conveys the notion of "to prepare" or "to provide". When joined, the compound literally evokes the idea of "that which is set up and provided", naturally arriving at its modern meaning of "equipment" or "facilities", the physical apparatus installed and made ready for use.