What is defined as installed receptacles, devices, or appliances that handle liquids or liquid-borne waste?

The term that is defined as installed receptacles, devices, or appliances that handle liquids or liquid-borne waste is "fixtures." In plumbing, fixtures refer to devices such as sinks, toilets, showers, and bathtubs that are directly connected to the plumbing system and are responsible for holding or transporting water and waste. These fixtures are designed to facilitate the use of water for various purposes while ensuring proper drainage and sanitation.

Understanding fixtures is crucial for plumbing professionals, as they are integral components of residential and commercial plumbing systems. They are equipped to manage the flow of liquids, thereby playing a significant role in maintaining hygiene and function within a structure.

In contrast, drainage systems refer broadly to the pipes and structures used to carry waste away from fixtures, traps are specific components that prevent sewer gases from entering buildings, and appurtenances are supplementary devices or equipment associated with the plumbing system but do not directly handle liquids themselves. Each of these terms represents a specific aspect of plumbing, but "fixtures" precisely fits the definition provided in the question.