A rigid structure to support electric cables; a type of raceway, normally having the appearance of a ladder and open at the top to facilitate changes.
The pipes, together with the joints, tanks, stopcocks, taps, and other fixtures of a water, gas, or sewage system in a house or other building.
A system of vessels or ducts in the human body, especially the genitourinary system.
The trade or occupation of a plumber.
Practical, concrete work serving to support other work.
A Murasugi sum where each disk summed along has its boundary subdivided into four segments.