Which term refers to the application of a device that prevents the use of a machine?

The term that refers to the application of a device that prevents the use of a machine is known as "Lockout." This process is crucial in ensuring the safety of workers during maintenance or repair tasks. By applying a lockout device, the machine is effectively rendered inoperable, which protects workers from accidental energization or startup while they are performing their tasks.

Lockout procedures are part of a broader safety framework known as Lockout/Tagout (LOTO), which also includes tagging the equipment to inform others that it should not be operated. While tagging is an important aspect, it serves as a warning rather than a physical means to prevent operation, which is why "Lockout" specifically is the term that aligns with the application of a device to stop machine use.