Andalé Mono (usually appearing as Andale Mono) is a monospaced sans-serif typeface designed by Steve Matteson for terminal emulation and software development environments, originally for the Taligent project by Apple Inc. and IBM. The Andalé design was originally created by Monotype, as part of Andalé font families.
Andalé Mono was first distributed as an Internet Explorer 4.0 add-on, originally under the name Monotype.com. Starting with version 1.25 of the font, it was renamed to Andale Mono, and distributed with Internet Explorer 5 and 6.
This typeface is no longer distributed with modern versions of Microsoft Windows (from Windows ME onwards), having been replaced by Lucida Console. It is still available for download as part of the Core fonts for the Web package on Sourceforge and it is bundled with Mac OS X.
Read more about Andalé Mono: Retail Versions, Andale Mono WT