Logo

Logo is a programming language designed for educational purposes to teach computer concepts to children. It is best known for its set of commands to control an electronic "turtle", either an actual robot turtle with a pen attached, or a "virtual turtle" simulated on the computer screen. However, it is a fully-functional programming language able to do other operations such as math without necessarily involving any turtles.

Its syntax was influenced by LISP, but without the parentheses.