WSFN (Which Stands for Nothing)[1] is an interpreted programming language for controlling robots created by Li-Chen Wang. It was designed to be as small as possible, a "tiny" language,[2] similar to Wang's earlier effort, Palo Alto Tiny BASIC.[3][4] WSFN was first published in Dr. Dobb's Journal in September 1977.
The language consists primarily of single-letter commands to tell a robot to move in certain directions, while other commands perform tests or basic mathematical operations. These can be grouped into named macros to produce more complex programs. The original version also included code that simulated the robot as a cursor on the VDM-1 display, or graphically on a Cromemco Dazzler display. This is similar to the turtle graphics added to the Logo programming language in 1969.
Extended WSFN is an implementation created for the Atari 8-bit computers written by Harry Stewart and published by the Atari Program Exchange[5] in 1981. In addition to supporting turtle graphics, it adds a number of commands to control the graphics and sound capabilities of that platform. It was offered as a "beginner's language with emphasis on graphics".[citation needed]