Logo is a multi-paradigm computer programming language used in education. It is an adaptation and dialect of the Lisp language; some have called it Lisp without the parentheses.[It was originally conceived and written as a functional programming language, and drove a mechanical turtle as an output device. It also has significant facilities for handling lists, files, I/O, and recursion. Today it is remembered mainly for its turtle graphics, though for tertiary level teaching it has been superseded by Scheme, and scripting languages.