The Howdy Glossary

PL/0 (Programming Language zero) is an educational programming language designed for teaching compiler theory. Created by Professor Niklaus Wirth in the late 1960s, it serves as a simple tool to demonstrate compiler construction techniques without the complexity of real-world languages. PL/0's syntax, which is similar to ALGOL and Pascal, features block structure and recursive subprogram definitions.
The programming language has been used as an example in many introductory courses on compilers and programming language design but hasn't gained wide adoption outside of academic contexts.