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.
Or, it is very possible that you have polybutylene supply lines. They're gray in color as well. Do a quick search for PB plumbing and you'll see a lot of failures and subsequent class action suits. I'm skeptical that anyone would use electrical conuit, but stranger things have happened.