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.
Also known as an IP PBX, Unified Communications System or business phone system, a PBX acts as the central switching system for phone calls within a business.PBX systems handle internal traffic between stations and act as the gatekeeper to the outside world.lso known as an IP PBX, Unified Communications System or business phone system, a PBX acts as the central switching system for phone calls within a business.