Monaco is a monospaced sans-serif typeface designed by Susan Kare and Kris Holmes.

The original Monaco 9-point bitmap font was designed so that when a Compact Macintosh window was displayed full screen, such as for a terminal emulator program, it would result in a standard text user interface display of 80 columns by 25 lines.

[2][3] With the August 2009 release of Mac OS X 10.6 Snow Leopard, Menlo was introduced as the default monospaced font instead of Monaco in Terminal and Xcode,[4] However, Monaco remains a part of macOS.

Monaco is the default font in the current Python IDLE when used on a Mac running OS X El Capitan.

Furthermore, in September 2015, Mac OS X 10.11 El Capitan introduced SF Mono, a monospaced variant of the San Francisco font family, as the default monospaced font instead of Menlo.