The ZX81 font is a monospaced typeface that was originally developed for the ZX81, a popular home computer that was released in 1981 by Sinclair Research. The font is characterized by its blocky, pixelated appearance, which was a result of the ZX81's limited graphics capabilities. Despite its limitations, the ZX81 font has become an iconic symbol of the early days of computing, and it continues to be used in a variety of contexts today, including retro-inspired designs, computer emulators, and programming environments.