Off-line equipment refers to machinery or devices that are not currently connected or integrated with an online network or system. There are several synonyms for this term, including disconnected equipment, standalone devices, and isolated machines. Another similar term is offline devices, which also describes equipment that is not connected to an online network or system. Additionally, the term unconnected devices can also be used to describe off-line equipment. These synonyms are commonly used in the manufacturing and industrial industries, where certain machinery and equipment may not necessarily require online connectivity for their operation.