In recent XFree86 and X.Org incarnations of the X Window System, it can be accessed as a compose sequence of two straight question marks, i.e. pressing
Nowadays it is rarely used, however it is still supported by the latest X.org server.
Although the X.Org Server supports the correct keyboard (ro comma) since at least 2005, selecting this keyboard from the user interface (e.g. GNOME Keyboard Properties) has only recently been made possible.
The X.Org Server, the reference implementation of X developed by the Foundation.
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While Dawes explained this as an attempt to make sure the XFree86 developers get their due credit (apparently in response to the Xouvert fork), the decision was contested in the XFree86 community, notably by Jim Gettys and Keith Packard, and the dissenters subsequently forked the project into the X.Org Server.
GNU Unifont is a bitmap-based font created by Roman Czyborra that is present in most free operating systems and windowing systems such as Linux, XFree86 or the X.Org Server.