Espy Sans is a bitmap font created by Apple Computer and used for the Newton PDA project and their eWorld online bulletin board service. It was later adapted for use in the Apple Guide help system and some versions of the iPod, particularly the iPod mini. Before the release of the Charcoal font used for Mac OS 8 and 9, it was a popular replacement system font for reskinnings of Mac OS 7.x, being included in system extensions such as Greg Landweber's Aaron extension.
References
Espy Sans Wikipedia(Text) CC BY-SA