Bd Font |link| Site

: A secondary syntax, .bd S font N , allows you to embolden a "Special" font (S) only when a specific current font is active. This is particularly useful for ensuring mathematical symbols match the weight of the surrounding bold text.

: When creating widgets like text boxes or buttons, the bd (border) attribute is sometimes confused with font styling, though they are distinct parameters within the widget configuration. Groff - The GNU troff Manual bd font

These fonts use a proprietary encoding system (often based on the ASCII table) and are not compatible with the internet or databases without conversion. : A secondary syntax,