We can actually deduce here that when a box contains fittings such as luminaire studs, clamps, or hickeys, the number of conductors permitted in the box is one less for each type of device.
What is a device?
A device is actually known to a tool or instrument that is designed for the purpose of using it to carry out a specific or multiple task. Devices are actually designed according to their usage.
We see that devices can go a long way to perform multiple task as a result of what they were designed to do. For example, the smartphone is a device which is designed for many purposes. It call be used for communicating, financial transactions, gaming, etc.
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