Axiom is  a general purpose Computer Algebra system. It is useful for research and development of mathematical algorithms. It defines a strongly typed, mathematically correct type hierarchy. It has a programming language and a built-in compiler.
Polybutylene is simply a type of plumbing material that was manufactured between the late 70's and early 90's. It is thought that it was installed in over 6 million homes during that time period.
1. plumbing-utility consisting of the pipes and fixtures for the distribution of water or gas in a building and for the disposal of sewage. plumbing system. plumbing fixture-a fixture for the distribution and use of water in a building.